Etymology
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insure (v.)

mid-15c., insuren, spelling variant of ensuren "to assure, give formal assurance" (late 14c.), also "make secure, make safe" (c. 1400), from Anglo-French enseurer, Old French ensurer, from en- "make" (see en- (1)) + seur, sur "safe, secure, undoubted" (see sure (adj.)).

The particular commercial senses of "make safe against loss by payment of premiums; undertake to ensure against loss, etc." are from mid-17c. (replacing assure in that meaning). Related: Insured; insuring.

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Definitions of insure

insure (v.)
be careful or certain to do something; make certain of something;
Synonyms: see / check / see to it / ensure / control / ascertain / assure
insure (v.)
make certain of;
Synonyms: guarantee / ensure / assure / secure
insure (v.)
protect by insurance;
Synonyms: cover / underwrite
insure (v.)
take out insurance for;
From wordnet.princeton.edu