Secrecy
来自Big Physics
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late Middle English: from secret, probably on the pattern of privacy .
wiktionary
Alteration (on model of primacy, etc) of Late Middle English secretee, from Old French secré.
etymonline
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.
