Definition of -ency in English:

-ency

suffix

  • Forming nouns:
  • 1Denoting a quality: efficiency
  • 2Denoting a state: presidency

Origin

from Latin -entia (compare with -ence).

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Definition of -ency in:

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space