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The Collaborative International Dictionary
Acescence

Acescence \A*ces"cence\, Acescency \A*ces"cen*cy\, n. [Cf. F. acescence. See Acescent.] The quality of being acescent; the process of acetous fermentation; a moderate degree of sourness.
--Johnson.

Wiktionary
acescence

n. The quality of being acescent; the process of acetous fermentation; a moderate degree of sourness.