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"dispersion" is also used as a crossword clue. If that's what you saw, the answer is often distribution (12 letters).
Definitions
the act of dispersing or diffusing something
Word origin
From disperse + -ion, from Middle English dispersioun, from Old French dispersion, from Latin dispersiō.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Scatter”10 letters
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D_________