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"compact" is also used as a crossword clue. If that's what you saw, the answer is often small (5 letters).
Definitions
closely and firmly united or packed together
Word origin
Borrowed from Latin compactum (“agreement”).
Used in a sentence
“In return for the sovereign's protection, they compacted to police the content of public literature.”
“glass, crystal, gems, and other compact bodies”
“a compact laptop computer”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“makeup case”7 letters
02“Small and dense”7 letters
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