Definition of -ency in English:

-ency

suffix

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

Origin

from Latin -entia (compare with -ence).

Definition of -ency in:

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Word of the day oleaginous
Pronunciation: ˌəʊlɪˈadʒɪnəs
adjective
rich in, covered with, or producing oil; oily