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.

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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.