Merriam-Webster's Word of the Day for April 26, 2026 is:

onerous • \AH-nuh-rus\  • adjective

Onerous means "involving, imposing, or constituting a burden." It typically describes something that is difficult and unpleasant to do or deal with.

// They were assigned the onerous task of post-show cleanup.

// The government imposed onerous taxes on imports.

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Examples:

"Morton professed joy at relinquishing politics and announced his intention to retire to his country estate, where he would henceforth be occupied with nothing more onerous than straightening out the pathways in his beautiful gardens." — Gareth Russell, The Six Loves of James I, 2025

Did you know?

The story behind onerous is at once straightforward and, dare we say, poetic. But perhaps that's putting the cart before the horse. Onerous rolled into the English language during the 14th century, via Middle French, from the Latin adjective onerosus, "burdensome." That word, in turn, was hitched to the noun onus, meaning "burden" (source too of our word onus, which usually refers to a burden or responsibility). Onus shares an ancient root with the Sanskrit word anas, meaning "cart." So although onerous stresses a sense of laboriousness and often figurative heaviness (especially because something is distasteful, e.g. "the onerous task of cleaning up the mess"), it has a deep connection with a literal weight borne by a person, horse, or other beast of burden.

Merriam-Webster's Word of the Day for April 25, 2026 is:

juxtapose • \JUK-stuh-pohz\  • verb

To juxtapose things is to place them together in order to create an interesting effect or to show how they are the same or different.

// The local museum’s new exhibit juxtaposes modern art with classical art.

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Examples:

“... on ‘Murder Most Foul’ [Bob] Dylan thwarts readymade nostalgia, an easy revisiting of the storybook sixties and his golden ‘spokesman’ moment. Instead, mixing and juxtaposing voices, lingos, and tones, he traces the decline of America over the trajectory of his own lifetime ...” — Robert Polito, After the Flood: Inside Bob Dylan’s Memory Palace, 2026

Did you know?

Although it doesn’t feature the word juxtapose, a classic segment from a 1969 episode of Sesame Street perfectly illustrates the essence of the verb. In it, the character Bob (as played by actor Bob McGrath) sings the catchy song “One of These Things (Is Not Like the Others)” in front of a display that juxtaposes—that is, places near one another for comparison—four items: an apple, an ice cream cone, a hamburger, and a mitten. The song asks its audience to consider their similarities and differences before deciding which is the most different (spoiler alert: it’s the mitten). The word juxtapose is likely a back-formation of the noun juxtaposition, which appropriately enough combines the Latin adjective juxta meaning “near” with the English word position. The use of juxtapose isn’t limited to tangible objects, however—images, ideas, concepts, and more are frequently juxtaposed.

Merriam-Webster's Word of the Day for April 24, 2026 is:

arboreal • \ahr-BOR-ee-ul\  • adjective

Arboreal is a formal and literary word used to describe something that relates to trees. It is also used in technical contexts to mean "living in or often found in trees," as in "arboreal primates."

// Despite weekly hikes on the same trail, she never ceases to be amazed by the arboreal beauty.

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Examples:

"In the saplings' early years, slow growth is the key to arboreal longevity, so the matriarch keeps her offspring in the shade." — Mike Dilger, The Guardian (London), 21 Oct. 2025

Did you know?

Arboreal took root in English in the 17th century, at a time when language influencers were eager to see English take on words from Latin and Greek. Apparently unsatisfied with a now-obsolete adjective treen meaning (as recorded in our Unabridged dictionary) "of, relating to, or derived from trees," they plucked arboreal from the Latin arboreus, meaning "of a tree"; its ultimate root is arbor, meaning "tree." That root arborized—that is, branched freely (to use the term figuratively): English abounds with largely obscure words that trace back to arbor, meaning "tree." Generally synonymous with arboreal are arboraceous, arborary, arboreous, and arborous. Synonymous with arboreal specifically in the sense of "relating to or resembling a tree" are arborescent, arboresque, arborical, and arboriform. Arboricole is a synonym of arboreal in its "inhabiting trees" sense. (The influencers may have overdone it a bit.) Arboreal is far more common than any of these, but other arbor words also have a firm hold in the language: arborvitae refers to a shrub whose name translates as "tree of life"; arboretum refers to a place where trees are cultivated; and arboriculture is the cultivation of trees. And of course we can't forget Arbor Day, which since 1872 has named a day set aside for planting trees. You'd be forgiven for assuming that the English word arbor, in the sense meaning "a garden shelter of tree boughs or vines twined together," is rooted in the same source as arboreal, but in fact it comes from the Latin noun herba, meaning "herb" or "grass."

Merriam-Webster's Word of the Day for April 23, 2026 is:

fortitude • \FOR-tuh-tood\  • noun

Fortitude is a formal word that refers to the strength of mind that enables someone to encounter danger or to bear pain or adversity with courage. Less formal words with similar meanings include grit, fiber, and pluck.

// To reach the summit of the mountain requires not only great physical strength and training but the fortitude to persevere no matter the challenge.

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Examples:

“Managing is never a one-size-fits-all process. Personality, fortitude, and experience all matter, as does context.” — Gary Deer, The Daily Gazette (Xenia, Ohio), 28 Mar. 2026

Did you know?

Fortitude comes from the Latin word fortis, meaning “strong,” and in English it has always been used primarily to describe strength of mind. For a time, the word was also used to mean “physical strength”; William Shakespeare used it that way in Henry VI, Part 1: “Coward of France! How much he wrongs his fame / Despairing of his own arm’s fortitude.” But despite use by the famous bard, that meaning languished and is now considered obsolete. Even the familiar phrase “intestinal fortitude” is just a humorous way to refer to someone’s courage or mental stamina, not the literal strength of their digestive system. (If you’re looking to describe a mighty gastrointestinal tract, we might suggest “iron stomach.”)

Merriam-Webster's Word of the Day for April 22, 2026 is:

tantamount • \TAN-tuh-mount\  • adjective

Something may be described as tantamount to something else if it is equal in value, meaning, or effect.

// The pop star’s fans see any criticism of her music as tantamount to a crime.

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Examples:

“... conducting requires more than merely gesturing with a baton—some pieces of music are tantamount to 80 minutes of hard cardio ...” — Mark Shanahan, The Boston Globe, 15 Mar. 2026

Did you know?

Although tantamount (from the Anglo-French phrase tant amunter, meaning “to amount to as much”) was used three different ways in the early 17th century—as a noun, verb, and adjective—the adjective form has since proven paramount to English users: it’s still in use while the noun and verb are obsolete. This is not to say that the adjective hasn’t experienced change over the years. While it was once acceptable to use tantamount in a variety of different sentence structures, nowadays it is almost always followed by the word to. And to use it before a noun, as in “the two old friends exchanged tantamount greetings,” would now be considered, er, tantamount to riding a penny-farthing or boneshaker onto the expressway.

Merriam-Webster's Word of the Day for April 21, 2026 is:

orthography • \or-THAH-gruh-fee\  • noun

Orthography refers to the way in which the words of a language are spelled, or to the art of writing words with the proper letters according to standard usage.

// As the winner of several spelling bees, she impressed her teachers with her exceptional grasp of orthography.

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Examples:

“Ormin, a medieval monk, sought to bring order to English orthography by addinng morre letterrs to worrds. August Thibaudin, a London professor, tried 9dding n3mbers. Our ideas for simplifying spelling have ranged from the rashonal to the redikulus to the döunnryt ubsërrd, and with each whimsical solution we seem to get further away from cognitive stability.” — Gabe Henry, Enough is Enuf: Our Failed Attempts to Make English Eezier to Spell, 2025

Did you know?

The concept of orthography (a term that comes from the Greek words orthos, meaning “right or true,” and graphein, meaning “to write”) was not something that really concerned English speakers until the introduction of the printing press in England during the 15th century. From that point on, English spelling became progressively more uniform. Our orthography has been relatively stable since the 1755 publication of Samuel Johnson’s A Dictionary of the English Language, with the notable exception of certain spelling reforms, such as the change of musick to music. Incidentally, many of these reforms were championed by Merriam-Webster’s own Noah Webster.

Merriam-Webster's Word of the Day for April 20, 2026 is:

indoctrinate • \in-DAHK-truh-nayt\  • verb

To indoctrinate someone is to teach them to fully accept the ideas, opinions, and beliefs of a particular group while categorically rejecting other ideas, opinions, and beliefs.

// The video series attempts to indoctrinate younger audiences with ahistorical and unscientific ideas.

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Examples:

"They worry about being 'cut off' from poetry, particularly by the jobs that they need to sustain their daily lives and that they fear may quietly indoctrinate them into a contrary value system." — Katy Waldman, The New Yorker, 2 Feb. 2026

Did you know?

Indoctrinate means "brainwash" in most contexts today, but its meaning wasn't always so negative. When the verb first appeared in English in the 17th century, it simply meant "to teach"—a meaning linked closely to its source, the Latin verb docēre, which also means "to teach." (Other offspring of docēre include docile, doctor, document, and, of course, doctrine). By the 19th century, indoctrinate was being used in the sense of teaching someone to fully accept only the ideas, opinions, and beliefs of a particular group.

Merriam-Webster's Word of the Day for April 19, 2026 is:

nugatory • \NOO-guh-tor-ee\  • adjective

Something described as nugatory is of little or no consequence. In law, nugatory describes something (such as a statute or agreement) without operative legal effect.

// Most of the criticism of the film in the weeks since its release has been nugatory nonsense.

// This new contract renders the previous agreement nugatory.

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Examples:

“Public outrage, fanned by the press, did not engage with the work but focused instead on taxpayers’ money having been squandered on a worthless ‘pile of bricks.’ In fact, the purchase price of [pounds sterling] 2,297 was nugatory, but the issue was never really about price but about rejecting the new and the challenging in art.” — Art Monthly, 1 Dec. 2025

Did you know?

Just because nugatory isn’t the most common word in the English language doesn’t mean it’s trifling. Rather, nugatory is literally trifling because the two words are synonymous, as in “comments too nugatory to merit attention.” Nugatory first appeared in English in the 17th century; it comes from the Latin adjective nugatorius, which can mean not only “trifling” or “frivolous” but also “futile.” This sense carried over into English as well, and so in some contexts nugatory means “ineffective” or “having no force,” as when Pulitzer Prize-winning novelist Marilynne Robinson invoked “the nugatory value of the contemporary penny.” Nugatory may mean little to some, but we think it’s worth a pretty penny.

Merriam-Webster's Word of the Day for April 18, 2026 is:

hiatus • \hye-AY-tus\  • noun

In general contexts, hiatus usually refers to a period of time when something, such as an activity or program, is suspended. In biology, hiatus describes a gap or passage in an anatomical part or organ, and in linguistics, it refers to the occurrence of two vowel sounds without pause or intervening consonantal sound.

// The actor, who’s been on hiatus for several years, will be starring in a new film.

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Examples:

“Following its return in 2025 after a nearly three-year hiatus, the 52nd American Music Awards are heading back to Las Vegas to be broadcast live from a new venue, the MGM Grand Garden Arena.” — Steven J. Horowitz, Variety, 10 Mar. 2026

Did you know?

This brief hiatus in your day is brought to you by, well, hiatus. While the word now most often refers to a temporary pause, hiatus originally referred to a physical opening in something, such as the mouth of a cave, or, as the 18th century British novelist Laurence Sterne would have it, a sartorial gap: in the wildly experimental novel Tristram Shandy, Sterne wrote of “the hiatus in Phutatorius’s breeches.” Hiatus comes from the Latin verb hiare, meaning “to yawn,” which makes it a distant relation of both yawn and chasm. And that’s all we have for now—you may resume your regular activities.

Merriam-Webster's Word of the Day for April 17, 2026 is:

postulate • \PAHSS-chuh-layt\  • verb

Postulate is a formal word used to mean “to suggest something, such as an idea or theory, especially in order to start or continue a discussion.”

// Scientists have postulated the existence of water on the planet’s largest moon.

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Examples:

“Based on their findings, researchers postulate that Homo sapiens reacted better to lead exposure evolutionarily than Neanderthals, a species that were close relatives to Homo sapiens and that went extinct around 40,000 years ago.” — Mason Leath, ABC News, 16 Oct. 2025

Did you know?

When you postulate an idea or theory you suggest that it is true especially for the purposes of an argument or discussion. The word postulate is mostly at home in formal and academic contexts, but don’t let that stop you from postulating, for example, that takeout for dinner makes sense given the cook’s delayed return home from work, or that a thunderstorm is imminent given the cumulonimbus building on the horizon. This “hypothesize” sense of postulate emerged in the early 18th century, but the verb first appeared in English centuries earlier in ecclesiastical contexts, as recorded in our Unabridged dictionary. To postulate someone, according to this sense of the word, was to request that a higher authority in the church sanction their promotion even though they would otherwise be disqualified by church rules or regulations.