Countess

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Middle English: from Old French contesse, from late Latin comitissa, feminine of comes (see count2).

wiktionary

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From Anglo-Norman cuntesse, Old French contesse, from Latin comitessa.

etymonline

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countess (n.)

mid-12c., adopted in Anglo-French for "the wife of an earl," from Medieval Latin cometissa, fem. of Latin comes "count" (see count (n.1)). Also used to translate continental titles equivalent to the fem. of earl.