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definitions

-acy

a suffix of nouns of quality, state, office, etc., many of which accompany adjectives in -acious or nouns or adjectives in -ate: fallacy; papacy; legacy; delicacy; piracy.

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A Long List of Affixes: Suffixes, Prefixes, and Combining FormsSuffixes -able, -ible, -ile:  (form adjs) able to, fit to, worthy, capable; apt to; subject to being ~-ed -ac:  one affect with -ac, -al, -ane, -ar, -ary, -ch, -ese, -ic, -ical, -id, -ile, -ine, -ish, -ory:  like, of, pertaining to; characterized by -aceae:  families of plants -aceous, -ous:  resemblance to a substance; full of -acy, -age, -ance, -ancy, -asm, -dom, -ence, -ency, -hood, -ism, -ity, -ment, -mony, -ness, -ry, -ship, …
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Nearby words

  1. -acea,
  2. -aceae,
  3. -aceous,
  4. -acious,
  5. -acity,
  6. -ad,
  7. -ade,
  8. -adelphous,
  9. -ades,
  10. -ado

Origin of -acy

< Latin -ācia, -ātia (spelling interchangeably in Medieval Latin, reflecting the Rom merger of the forms); these are in turn complexes of -āc- and -āt- -ate1 + -ia -y3. Cf. -cracy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019