Secrecy

google

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late Middle English: from secret, probably on the pattern of privacy .

wiktionary

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Alteration (on model of primacy, etc) of Late Middle English secretee, from Old French secré.

etymonline

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secrecy (n.)

1570s, from secretee, "quality of being secret" (early 15c.), from Old French secré, variant of secret (see secret (n.)) + -ty (2). Form altered on model of primacy, etc.