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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.

Merriam-Webster's Word of the Day for April 16, 2026 is:

brazen • \BRAY-zun\  • adjective

Brazen describes someone who is acting, or something that is done, in a very open and shocking way without shame or embarrassment.

// The opposition party’s campaign has not been shy in assailing the brazen corruption of the incumbent for funneling public funds into private coffers.

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Examples:

“There are no coyotes on Block Island. However, they have a presence in all of Rhode Island’s other communities. ... This all makes sense, because Rhode Island, for the most part, is a heavily wooded area. Furthermore, rabbits, berries, mice and voles are in plentiful supply; add to this a burgeoning population, eventually food may become an issue. This is where the clever coyote is perhaps becoming more brazen and bold while hunting for food in certain neighborhoods.” — J. V. Houlihan, The Block Island (Rhode Island) Times, 30 Jan. 2026

Did you know?

The oldest meaning of brazen, which traces back to the Old English word for “brass,” bræs, is a literal one: “made of brass” (you might on occasion encounter “brazen cups” or “brazen doors” in something you’re reading). Over the centuries, brazen picked up a number of figurative senses stemming from the physical properties of brass, from its strength to its sound to its color, as when poet Henry Wadsworth Longfellow wrote of “The glory that the wood receives, / At sunset, in its brazen leaves.” But it’s the hardness of brass that led eventually to the now common “shameless” meaning of brazen. Consider this passage written by the minister Thomas Doolittle in the late 1600s: “... though thinkest it no shame, or if thou dost, thou has a face of brass ... and blushest not ...” A face of brass, or a “brazen face” (a phrase recorded in writing as early as the late 1500s) is one that is more or less immobile, betraying no sign of shame of wrongdoing. Today, brazen is used not just for people who are openly shameless or disrespectful, but for openly shameless or disrespectful behavior, as in “a brazen disregard for the rules.”