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"except" is also used as a crossword clue. If that's what you saw, the answer is often but (3 letters).
Definitions
prevent from being included or considered or accepted
Word origin
Borrowed from Middle French excepter, from Latin exceptus.
Used in a sentence
“I find most people annoying — present company excepted, of course!”
“But this [ban on circumcision] must have been a provocation, as the emperor Antoninus Pius later acknowledged by excepting the Jews.”
“to except to a witness or his testimony”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Not including”6 letters
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