Merriam-Webster's Word of the Day

Merriam-Webster's Word of the Day for March 10, 2026 is:





mea culpa • \may-uh-KOOL-puh\ • noun

The noun mea culpa is used for a formal acknowledgment of personal fault or error.

// The podcast host's mea culpa did little to satisfy those who found the episode deeply offensive.

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Examples:

"... his apology was the best public mea culpa of this century. ... It was delivered without hesitation, qualification or blame shifting." — John Mosig, The Age (Melbourne, Australia), 24 Oct. 2025





Did you know?

Mea culpa means "through my fault" in Latin. Said by itself, it's an exclamation of apology or remorse that is used to mean "It was my fault" or "I apologize." Mea culpa is also a noun, however. A newspaper might issue a mea culpa for printing inaccurate information, or a politician might give a speech making mea culpas for past wrongdoings. Mea culpa is one of many English terms that come from the Latin culpa, meaning "guilt." Some other examples are culpable ("meriting condemnation or blame especially as wrong or harmful"), culprit ("one guilty of a crime or a fault"), and exculpate ("to clear from alleged fault or guilt").

Merriam-Webster's Word of the Day for March 9, 2026 is:





hector • \HEK-ter\ • verb

To hector someone is to criticize or question them in a threatening way.

// The judge ordered the attorney to stop hectoring the witness.

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Examples:

“He continued to hector Neal about his inattention to business (‘I have been waiting to hear from you,’ again, and again, and again), without any tangible results.” — Jem Aswad, Variety, 5 Aug. 2025





Did you know?

In Homer’s Iliad, Hector, the eldest son of King Priam of Troy, was a model soldier, son, father, and friend, the champion of the Trojan army until he was killed by the Greek hero Achilles. So how did his name become a verb meaning “to intimidate or harass”? That use was likely influenced by gangs of rowdy street toughs who roamed London in the 17th century and called themselves “Hectors.” They may have thought themselves gallant young blades (that’s sense 3b(3)), but to the general populace they were swaggering bullies who intimidated passersby and vandalized property.

Merriam-Webster's Word of the Day for March 8, 2026 is:





crepuscular • \krih-PUHSS-kyuh-ler\ • adjective

Crepuscular means “of, relating to, or resembling twilight.” It is used in zoological contexts to describe creatures that are active during twilight, or the activities of such creatures.

// As evening came on, fireflies began to appear in the crepuscular gloaming.

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Examples:

“To gaze upon a platypus is to witness a jumble of contradictions. … Even when you see one with your own eyes—say, paddling underwater, absorbed in her crepuscular rooting—the platypus (Ornithorhynchus anatinus) remains hard to believe.” — Kathleen Yale, Orion, Winter 2025/2026





Did you know?

The early Romans had two words for the twilight. Crepusculum was favored by Roman writers for the half-light of evening, just after the sun sets; diluculum was reserved for morning twilight, just before the sun rises—it is related to lūcidus, meaning “bright.” (Crepusculum was likely modeled on diluculum, from the assumed root krepos-, meaning “twilight.”) English speakers didn’t embrace either of these Latin nouns as substitutes for the word twilight, but they did form the adjective crepuscular in the 17th century. The word’s zoological sense, relating to animals that are most active at twilight, developed in the 19th century.

Merriam-Webster's Word of the Day for March 7, 2026 is:





libertine • \LIB-er-teen\ • noun

A libertine is in broad terms a person who is unrestrained by convention or morality. More narrowly, the word describes someone who leads an immoral life.

// The legend of Don Juan depicts him as a playboy and libertine.

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Examples:

"As horrifying as some of the sins of Victorian scholarship may have been, it would have been anathema to these students of classical philosophy to simply throw out Plato. But that's what some of their modern inheritors have tried to do. … It's worth noting that we might not have Plato's work at all, were it not carefully studied and preserved by the Islamic scholars (hardly libertines themselves) of the medieval period." — R. Bruce Anderson, The Ledger (Lakeland, Florida), 1 Feb. 2026





Did you know?

"I only ask to be free," says Mr. Skimpole in Charles Dickens' Bleak House. His words would undoubtedly have appealed to the world's first libertines. The word libertine comes from the Latin lībertīnus, a word used in early writings of Roman antiquity to describe a formerly enslaved person who had been set free (the Roman term for an emancipated person was the Latin lībertus). Middle English speakers used libertine to refer to a freedman, but by the late 1500s its meaning was extended to freethinkers, both religious and secular, and it later came to imply that an individual was a little too unrestrained, especially in moral affairs. The likely Latin root of libertine is līber, the ultimate source of our word liberty.

Merriam-Webster's Word of the Day for March 6, 2026 is:





vaunted • \VAWN-tud\ • adjective

Vaunted describes someone or something that is often spoken of or described as very good or great.

// The team’s vaunted defense faltered in the second half of the game.

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Examples:

“After much initial hype, the much vaunted new production partnership fizzled out after just two seasons, leaving the franchise scrambling for a new direction and without a lead actor in its signature role.” — Lacy Baugher, Den of Geek, 22 Jan. 2026





Did you know?

The verb vaunt has been used since the 15th century with the meaning “to make a vain display of one’s own worth or attainments”—in other words, “to brag or boast.” Over time, vaunt developed the meaning “to boast of (a particular thing),” as in “the promotional flier vaunts the natural beauty of the area,” and that use gave rise to the adjectival form vaunted. The history of vaunt and vaunted leads back to the Latin word vānus, with the meanings “lacking content, empty, illusory, marked by foolish or empty pride.” The word vain itself is also a descendant of vānus.