Merriam-Webster's Word of the Day for July 4, 2026 is: semiquincentennial \sem-ee-kwin-sen-TEN-ee-ul\ noun Semiquincentennial refers to a 250th anniversary or its celebration. The word can also be used as an adjective to describe something related to or associated with such an anniversary or its celebration, as in “semiquincentennial festivities.” // The town’s annual fireworks show promises to be even more spectacular than usual in honor of the nation’s semiquincentennial. [See the entry >](https://www.merriam-webster.com/dictionary/semiquincentennial) Examples: “July 4, 2026 marks the nation’s semiquincentennial—its 250th birthday since the signing of the Declaration of Independence.” — Kathryn Palmer, USA Today, 13 June 2025 Did you know? Everyone knows that if you stick a feather in your hat for, say, a Fourth of July celebration, it is called “[macaroni](https://bit.ly/43P4YWP).” But what does a Yankee Doodle Dandy call the celebration itself, specifically when it marks the 250th year since the nation’s founding? Such a special day calls for a special word and semiquincentennial fits the bill, as it does for any anniversary of the same esteemed and venerable vintage. If the word’s mouthful of seven syllables overwhelms, it’s simple to break down. The prefix [semi-](https://bit.ly/4oM9E9l) here means “half in quantity or value,” while quincentennial refers to a whopping 500th anniversary or its celebration. (Quin- comes from the Latin word quinque, meaning “five,” and centennial comes in part from the Latin centum, meaning “hundred.”) Hence a semiquincentennial is celebrated precisely halfway en route to a quincentennial. May knowing this etymology be [a feather in your cap](https://bit.ly/44r8Ehx) at your semiquincentennial BBQ.

Merriam-Webster's Word of the Day for July 3, 2026 is: corrode \kuh-ROHD\ verb Corrode means "to slowly break apart and destroy (metal, an object, etc.) through a chemical process" or "to undergo such a process." It is also used as a synonym of [undermine](https://www.merriam-webster.com/dictionary/undermine) to mean "to gradually destroy or weaken." // Several sections of the pipe have corroded and will need to be replaced. // Years of lies and secrets had corroded their relationship. [See the entry >](https://www.merriam-webster.com/dictionary/corrode) Examples: "Each piece is made of durable steel with a powder coating that won’t rust, fade, or corrode in the weather." — Shea Simmons, Southern Living, 29 Apr. 2026 Did you know? Corrode comes from the Latin verb corrōdere, meaning "to gnaw or chew up." Corrōdere, in turn, combines the prefix cor- (used here as an intensifier with the meaning of "completely") with the verb rōdere ("to gnaw"). (You may recognize another rōdere descendent, [rodent](https://www.merriam-webster.com/dictionary/rodent), as a word for members of an order of gnaw-happy mammals.) At one time, corrode was used to literally indicate the action of gnawing away, as in "woodworms corroded the wood." But it is the more figurative senses from the action of gnawing or eating away that have persisted, as in "salt water corroded the iron" or "a lack of transparency by local officials is corroding public trust."

Merriam-Webster's Word of the Day for July 2, 2026 is: sagacious \suh-GAY-shus\ adjective Someone or something described as sagacious has or shows an ability to understand difficult ideas and situations and to make good decisions. Sagacious may be considered a formal synonym of [wise](https://www.merriam-webster.com/dictionary/wise) and [discerning](https://www.merriam-webster.com/dictionary/discerning). // Student reviews paint the writing professor as a sagacious mentor and a compassionate teacher. [See the entry >](https://www.merriam-webster.com/dictionary/sagacious) Examples: “It’s a lyrical truism with the kind of wisdom that feels particularly sagacious only within the context of pop music: Of course breaking up is hard to do, but when expressed by [Neil] Sedaka at the end of each verse (and the beginning of each bridge) of his pained plea to his partner to ‘give our love another try,’ it feels like hard-earned insight.” — Andrew Unterberger, Billboard, 2 Mar. 2026 Did you know? You might expect, wise word wonk that you are, that the word sagacious is etymologically linked with [sage](https://www.merriam-webster.com/dictionary/sage), which, as an adjective, means “[wise](https://www.merriam-webster.com/dictionary/wise)” or, as a noun, “a wise person.” However, despite similarities of spelling, sound, and sense, the two words are not closely related. Sagacious comes from sagire, a Latin verb meaning “to perceive keenly,” while sage comes from a different Latin verb, sapere, which means “to taste,” “to have good taste,” or “to be wise.” Sagacious entered the English language around the beginning of the 17th century and, for some decades, referred to perceptiveness of sight, taste, and especially, smell, hewing close to its Latin ancestor. It has largely lost the sense (no pun intended) of sensory keenness, and now almost exclusively describes someone or something displaying keen, discerning judgment.

Merriam-Webster's Word of the Day for July 1, 2026 is: nabob \NAY-bahb\ noun A nabob is a very rich or important person. // The upscale hotel downtown is a popular meeting spot for the city’s corporate nabobs. [See the entry >](https://www.merriam-webster.com/dictionary/nabob) Examples: “NBA nabobs were dismayed by the player empowerment era, where players dictated trades or abandoned teams via free agency.” — Christopher L. Gasper, The Boston Globe, 26 Jan. 2025 Did you know? In India’s [Mogul Empire](https://www.britannica.com/topic/Mughal-dynasty), founded in the 16th century, provincial governors carried the [Urdu](https://www.merriam-webster.com/dictionary/Urdu) title of nawāb. In 1612, Captain Robert Coverte published a report of his “discovery” of “the Great Mogoll, a prince not till now knowne to our English nation.” The Captain informed the English-speaking world that “An earle is called a Nawbob,” thereby introducing the English version of the word. Nabob, as it later came to be spelled, gained its extended sense of “a prominent person” in the 18th century, when it was applied sarcastically to British officials of the [East India Company](https://www.britannica.com/topic/East-India-Company) returning home after amassing great wealth in Asia. But the word was most famously used by Vice President [Spiro Agnew](https://www.britannica.com/biography/Spiro-Agnew), in a 1970 speech written by William Safire, when he referred to critical members of the news media as “[nattering](https://www.merriam-webster.com/dictionary/natter) nabobs of negativism.”

Merriam-Webster's Word of the Day for June 30, 2026 is: bereft \bih-REFT\ adjective To be bereft is to be deprived or robbed of something, or to lack something that you need, want, or expect. Bereft is also used as a synonym of [bereaved](https://www.merriam-webster.com/dictionary/bereaved). // They appear to be completely bereft of new ideas. [See the entry >](https://www.merriam-webster.com/dictionary/bereft) Examples: "... this morning when I was going out to play in the gardens, I went to put on my favorite baseball cap since the sun was hot and, being bereft of my own natural covering, I wished to avoid a sun-scorched scalp." — Dick Brooks, The Daily Gazette (Schenectady, New York), 7 May 2026 Did you know? In Old English, the verb berēafian meant "to deprive of something." The modern equivalent (and descendant) of berēafian is [bereave](https://www.merriam-webster.com/dictionary/bereave), a verb used to say that one has deprived or stripped someone of something, often suddenly and unexpectedly, and sometimes by force. Bereft comes from the past participle of bereave; Shakespeare uses the participle in The Merchant of Venice, when Bassanio tells Portia, "Madam, you have bereft me of all words." But by Shakespeare's day bereft was also being used as an adjective. The Bard uses it in The Taming of the Shrew, as a newly obedient and docile Katharina declares, "A woman mov'd is like a fountain troubled—muddy, … thick, bereft of beauty."

Merriam-Webster's Word of the Day for June 29, 2026 is: umami \oo-MAH-mee\ noun Umami refers to the taste sensation that is produced by several amino acids and nucleotides and that has a rich or meaty flavor characteristic of cheese, cooked meat, mushrooms, soy, and ripe tomatoes. // The chef’s secret ingredient added the perfect burst of umami to the signature dish. [See the entry >](https://www.merriam-webster.com/dictionary/umami) Examples: "This recipe uses a classic marble cake technique to swirl rich layers of cinnamon into a fluffy olive oil-scented loaf cake. It’s topped with a malted milk glaze for a punch of umami, but you can skip it entirely or substitute a simple vanilla glaze." — Tanya Bush, Will This Make You Happy: Stories & Recipes from a Year of Baking, 2026 Did you know? Japanese scientist Kikunae Ikeda is credited with identifying as a distinct taste the savory flavor of the amino acid glutamic acid, which he first noticed in soup stocks made with seaweed. This fifth basic taste—alongside sweet, sour, salty, and bitter—was named umami, meaning "savoriness" in Japanese. Umami can be experienced in foods such as mushrooms, anchovies, and mature cheeses, as well as in foods enhanced with monosodium glutamate, or MSG, a sodium salt derived from glutamic acid.

Merriam-Webster's Word of the Day for June 28, 2026 is: gainsay \gayn-SAY\ verb To gainsay something is to deny or disagree with it, or to show or say that it is not true. Gainsay is a formal word usually used in negative statements. // Although the defendant initially denied involvement in the incident, there was no gainsaying the evidence that the prosecutor presented at the trial. [See the entry >](https://www.merriam-webster.com/dictionary/gainsay) Examples: “Whatever you think of it, there’s no gainsaying the fact that ‘The Sound of Music’ is a remarkably durable vehicle. It’s frequently produced, and suffered no lasting damage to its reputation from a live NBC performance in 2013 ...” — Don Aucoin, The Boston Globe, 9 Jan. 2026 Did you know? You might have trouble figuring out the meaning of gainsay if you’re thinking of our modern word [gain](https://www.merriam-webster.com/dictionary/gain) plus [say](https://www.merriam-webster.com/dictionary/say). It should help to know that the gain part comes to us from the Old English word gēan-, meaning “against” or “in opposition to.” (The familiar verb gain comes from Anglo-French and is unrelated.) In Middle English, gēan- was joined to seyen (“to say”) to form gein-seyen, which led to the modern word gainsay. So when you see gainsay, think “to say against”—that is, “to deny” or “to contradict.”

Merriam-Webster's Word of the Day for June 27, 2026 is: oracular \aw-RAK-yuh-ler\ adjective Oracular is a formal word that can describe something used to forecast or prophesize, or something that resembles or relates to something used for such purposes. Oracular can also describe something that resembles an [oracle](https://www.merriam-webster.com/dictionary/oracle)—a person (such as a priestess of ancient Greece) through whom a deity is believed to speak; in this sense, an oracular statement, voice, etc. conveys wisdom or solemnity. // A few recordings of the famous speaker still exist, and though his language is formal to the point of sounding almost foreign to the modern listener, the oracular quality of his speech remains effective. [See the entry >](https://www.merriam-webster.com/dictionary/oracular) Examples: "The conversation that unfolds is some of [writer Ben] Lerner's most brilliant and daring writing to date, a mad, oracular burst of speech—about technology, parenthood, and dreaming—that flits effortlessly between prose and poetry." — Kevin Lozano, Vulture, 3 Apr. 2026 Did you know? When the ancient Greeks had questions or problems, they would turn to the gods for answers by consulting an [oracle](https://www.merriam-webster.com/dictionary/oracle), a person through whom the gods communicated, usually in the form of cryptic verse. Oracle also referred to the god's answer or to the shrine that worshippers approached when seeking advice; the word's root is the Latin verb orare, which means "to speak." English speakers today can use oracle to simply refer to an authoritative pronouncement or to a person who makes such pronouncements—for example, "a designer who is an oracle of fashion." And the related adjective oracular is used in similar contexts: "a designer who is an oracular voice of fashion."

Merriam-Webster's Word of the Day for June 26, 2026 is: symbiosis \sim-bee-OH-sis\ noun Symbiosis is a formal word that refers to a relationship between two people or groups that work with and depend on each other. In biology, symbiosis refers to the relationship between two different kinds of living things that live together and depend on each other. // The new playground is the result of symbiosis between multiple stakeholders, including residents, donors, and town officials. // The bacteria exist in symbiosis with the plant’s roots. [See the entry >](https://www.merriam-webster.com/dictionary/symbiosis) Examples: “In the old days, which weren’t that long ago ... there was that ritual moment when a rock ‘n’ roll idol, in the midst of delivering a classic anthem, would point the mic away from himself and into the arena, indicating that it was time for the audience to take over and sing the lines. It might be Springsteen doing ‘Thunder Road,’ or Madonna doing ‘Holiday.’ ... The loving symbiosis of pop star and pop audience doesn’t get much more reverent than that.” — Owen Gleiberman, Variety, 7 May 2026 Did you know? Symbiosis was adopted by the scientific community in the late 1800s, coming ultimately (via German) from the Greek symbíōsis, meaning “living together, companionship.” Of course, there are a lot of ways to live together and, accordingly, several flavors of symbiosis. When a biological symbiosis between two organisms is mutually beneficial, it is termed [mutualism](https://www.merriam-webster.com/dictionary/mutualism). For example, [oxpeckers](https://www.merriam-webster.com/dictionary/oxpecker) are birds so named because they “peck” ticks off of infested cattle and wild mammals, a likely satisfying arrangement for both parties, and textbook mutualism. When one organism lives off another at the other’s expense, however (as, for one icky instance, head lice do), it’s called [parasitism](https://www.merriam-webster.com/dictionary/parasitism). If only parents of elementary school students could call upon an equivalent of oxpeckers to engage in mutualistic symbiosis when the need arose, but alas.

Merriam-Webster's Word of the Day for June 25, 2026 is: jaundiced \JAWN-dist\ adjective Jaundiced means “showing or influenced by feelings of distrust, distaste, or hostility.” Someone described as jaundiced, or as possessing jaundiced opinions or views, is typically understood to feel that way because of negative past experiences. // She developed a jaundiced view of politics after years of chairing her local school board committee and witnessing all kinds of petty shenanigans. [See the entry >](https://www.merriam-webster.com/dictionary/jaundiced) Examples: “Now, I’m not accusing the mayor of anything. I’m saying that all of these actions were highly inappropriate for an elected official. I voted for her, but will forevermore look at her actions with a jaundiced eye.” — Eric Rinehimer, The Retrospect (Collingswood, New Jersey), 23 Jan. 2026 Did you know? Cast not a jaundiced eye on the word jaundiced—and by that we mean this: don’t dislike or distrust jaundiced because of past experiences with the word or with others like it. Jaundiced is handy for describing the grumps among us who tend toward envy, aversion, or hostility, and who doesn’t know a few of those? This useful 17th century adjective comes from an also-useful 14th century noun [jaundice](https://www.merriam-webster.com/dictionary/jaundice) that still refers to a medical condition in which excess bile pigments in the bloodstream and body tissues cause a person’s skin to turn yellow. The connection between the physical condition and the bad attitude lies in the [physiological theory of the bodily humors](https://www.merriam-webster.com/words-at-play/humorless-humor-vocabulary), which holds that a hostile, irritable temperament is caused by excess yellow bile in one’s body.