Insurance
来自Big Physics
late Middle English (originally as ensurance in the sense ‘ensuring, assurance, a guarantee’): from Old French enseurance, from enseurer (see ensure). insurance (sense 1) dates from the mid 17th century.
wiktionary
From the older form ensurance, see also assurance.
etymonline
insurance (n.)
1550s, "engagement to marry," a variant of ensurance "an assurance, pledge, guarantee," from Old French enseurance "assurance," from ensurer, from en- "make" (see en- (1)) + sur "safe, secure, undoubted" (see sure (adj.)).
Commercial sense of "security against loss or death in exchange for payment" is from 1650s. Assurance was the older word for this specific sense (late 16c.). Compare insure.
