Definition of -acy in English:

-acy

Syllabification: -acy

suffix

Forming nouns of state or quality: celibacy lunacy

Origin

a branch of the suffix -cy, from Latin -atia (medieval Latin -acia), or from Greek -ateia, noun suffixes.

Definition of -acy in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous