Merriam-Webster's Word of the Day

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rationale
Merriam-Webster's Word of the Day for September 18, 2025 is: rationale • \rash-uh-NAL\ • noun Rationale refers to an explanation or reason for something said or done. It is often used with for, behind, or of. // City council members who oppose the zoning change should be ready to explain their rationale for voting against it. // She’s explained the rationale behind her early retirement. See the entry > Examples: “There is a rationale for commercializing seagrass production, but ecologically sustainable production needs to be at the heart of that business model, and the numbers for doing that simply don’t add up at the moment.” — Richard Lilley, quoted in Smithsonian Magazine, 7 Oct. 2024 Did you know? If someone asserts that the word rationale refers to a ration of ale, they are wrong, but that doesn’t mean they don’t have an actual rationale (a reason, explanation, or basis) for such a claim. “Rationale looks like the words ration and ale jammed together,” they could offer, and while that is true you’d be justified in responding: “Appearances can be deceiving.” Rationale is a direct borrowing of the Latin word rationale, with which it shares the meaning “an explanation of controlling principles of opinion, belief, practice, or phenomena.” The Latin rationale comes from a form of the adjective rationalis (“rational”), which traces back to the noun ratio, meaning “reason.” While the Latin ratio is also the forebear of the English noun ration, referring to a share of something, rationale has nothing to do with a tankard (or stein, or even a pony) of beer.
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jovial
Merriam-Webster's Word of the Day for September 17, 2025 is: jovial • \JOH-vee-ul\ • adjective Jovial describes people as well as moods, attitudes, etc., that are cheerful and jolly. // The audience was in a jovial mood as the headlining comedian walked onto the stage. See the entry > Examples: "Transport yourself to a sumptuous hidden garden somewhere in Europe, where the meats are plentiful and the specials oh so tantalizing. The rustic communal tables and jovial service will make you feel like you're hanging out with your extended family in the old country." — Briony Smith, The Toronto Star, 29 Mar. 2025 Did you know? In ancient Roman astrology, people were thought to share the personality traits of the god whose planet was rising when they were born. The largest planet was named after the chief Roman god Jupiter, also called Jove. Jove was a sky god and a bringer of light, as well as a great protector who kept heroes focused on being loyal to the gods, the state, and family. Ancient mythology is full of stories of Jupiter (Zeus in the Greek myths) behaving badly, but jovial points only to the joy and happiness of a supremely powerful god: it describes the cheerful and jolly among us. (Jovian is the adjective that describes what is simply related to Jove/Jupiter.) Jovial has historically been contrasted with saturnine, which describes those with a gloomy or surly disposition. Sad Saturn was the father of Jupiter and his siblings, and he was exiled (understandably) for swallowing them all.
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debunk
Merriam-Webster's Word of the Day for September 16, 2025 is: debunk • \dee-BUNK\ • verb To debunk something (such as a belief or theory) is to show that it is not true. // The influencer remained enormously popular despite having the bulk of their health claims thoroughly debunked. See the entry > Examples: “Conspiracy theorists (and those of us who argue with them have the scars to show for it) often maintain that the ones debunking the conspiracies are allied with the conspirators.” — Adam Gopnik, The New Yorker, 24 Mar. 2025 Did you know? To debunk something is to take the bunk out of it—that bunk being nonsense. (Bunk is short for the synonymous bunkum, which has political origins.) Debunk has been in use since at least the 1920s, and it contrasts with synonyms like disprove and rebut by suggesting that something is not merely untrue but is also a sham—a trick meant to deceive. One can simply disprove a myth, but if it is debunked, the implication is that the myth was a grossly exaggerated or foolish claim.
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askance
Merriam-Webster's Word of the Day for September 15, 2025 is: askance • \uh-SKANSS\ • adverb Askance means "in a way that shows a lack of trust or approval" or "with a side-glance." // I couldn't help but look askance at the dealer's assurances that the car had never been in an accident. // Several people eyed them askance when they walked into the room. See the entry > Examples: "In other cultures they might look askance at such a gnarly, leggy thing wedged into a loaf. But we know that a whole fried soft shell crab is one of the gifts of southeast Louisiana's robust seafood heritage." — Ian McNulty, The Times-Picayune/The New Orleans Advocate Online, 1 May 2025 Did you know? As with the similar word side-eye, writers over the years have used askance literally when someone is looking with a side-glance and figuratively when such a glance is conveying disapproval or distrust. Back in the days of Middle English you could use askaunce and a-skans and a-skaunces to mean “in such a way that,” “as if to say,” and “artificially, deceptively.” It’s likely that askance developed from these forms, with some help from asqwynt meaning “obliquely, askew.” Askance was first used in the 16th century with the meaning "sideways" or "with a sideways glance.”
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perpetuity
Merriam-Webster's Word of the Day for September 14, 2025 is: perpetuity • \per-puh-TOO-uh-tee\ • noun Perpetuity refers to a state of continuing forever or for a very long time. // The property will be passed on from generation to generation in perpetuity. See the entry > Examples: “This isn’t new territory for the band—beginning with 2018’s Modern Meta Physic, Peel Dream Magazine have taken cues from bands like Stereolab and Pram, exploring the ways that rigid, droning repetition can make time feel rubbery. As they snap back into the present, Black sings, ‘Millions of light years, all of them ours.’ The past and future fold into themselves, braided together in perpetuity.” — Dash Lewis, Pitchfork, 4 Sept. 2024 Did you know? Perpetuity is a “forever” word—not in the sense that it relates to a lifelong relationship (as in “forever home”), but because it concerns the concept of, well, forever. Not only can perpetuity refer to infinite time, aka eternity, but it also has specific legal and financial uses, as for certain arrangements in wills and for annuities that are payable forever, or at least for the foreseeable future. The word ultimately comes from the Latin adjective perpetuus, meaning “continual” or “uninterrupted.” Perpetuus is the ancestor of several additional “forever” words, including the verb perpetuate (“to cause to last indefinitely”) and the adjective perpetual (“continuing forever,” “occurring continually”). A lesser known descendent, perpetuana, is now mostly encountered in historical works, as it refers to a type of durable wool or worsted fabric made in England only from the late 16th through the 18th centuries. Alas, nothing is truly forever.
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