Assurance

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late Middle English (in assurance (sense 2)): from Old French, from assurer ‘assure’.

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From Middle English assuraunce, from Old French asseürance, from asseürer; as if assure +‎ -ance.

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assurance (n.)

late 14c., "formal or solemn pledge, promise," also "certainty, full confidence," from Old French asseurance "assurance, promise; truce; certainty, safety, security" (11c., Modern French assurance), from asseurer "to reassure, to render sure" (see assure). Meaning "self-confident" is from 1590s. The word had a negative tinge 18c., often suggesting impudence or presumption.