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"sufficiency" is also used as a crossword clue. If that's what you saw, the answer is often adequacy (8 letters).
Definitions
the quality of being sufficient for the end in view
Used in a sentence
“But the Eastern front of the Allies was far more vulnerable. Russia could not begin to supply herself with a sufficiency of large guns and of heavy munitionment for them.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Adequacy”11 letters
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