Merriam-Webster's Word of the Day

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  1. 1d ago

    semiquincentennial

    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 > 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.” 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- 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 at your semiquincentennial BBQ.

    2 min
  2. 3d ago

    sagacious

    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 and discerning. // Student reviews paint the writing professor as a sagacious mentor and a compassionate teacher. See the entry > 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, which, as an adjective, means “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.

    2 min
  3. Jun 27

    oracular

    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—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 > 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, 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."

    2 min
  4. Jun 26

    symbiosis

    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 > 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. For example, oxpeckers 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. 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.

    2 min
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