assure etymology

English word assure comes from Latin ad- (To.), Latin securus

Detailed word origin of assure

Dictionary entry	Language	Definition
ad-	Latin (lat)	To.
securus	Latin (lat)	Careless, negligent. Fearless. Quiet, composed, serene. Unconcerned, untroubled, carefree.
asseurer	Old French (842-ca. 1400) (fro)	To assure; to guarantee; to promise.
assure	English (eng)	(obsolete) To guarantee, promise (to do something).. (transitive) To make sure and secure.. (transitive, followed by that or of) To give (someone) confidence in the trustworthiness of (something).. To reassure.

Descendants of ad-: accept accident according add address admit affair agree alien appear appreciate around arrest arrive aside asleep assume attention attorney available disappear huge rest round size
Descendants of securus: assurance reassure secure security sure