abstention from sexual relations.
abstention by vow from marriage: the celibacy of priests.
the state of being unmarried.

Origin of celibacy

1655–65; < Latin caelibā(tus) celibacy (caelib-, stem of caelebs single + -ātus -ate3) + -cy
Related formscel·i·bat·ic [sel-uh-bat-ik] /ˌsɛl əˈbæt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Word Origin and History for celibacy

1660s, formed in English, with -cy + Latin caelibatus "state of being unmarried," from caelebs "unmarried," probably from PIE root *kaiwelo- "alone" + lib(h)s- "living."

Online Etymology Dictionary, © 2010 Douglas Harper