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ensure (v.)

late 14c., from Anglo-French enseurer, from en- "make" (see en- (1)) + Old French seur "sure" (see sure); probably influenced by Old French asseurer "assure." Compare insure. Related: Ensured; ensures; ensuring.

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Definitions of ensure from WordNet

ensure (v.)
make certain of;
This nest egg will ensure a nice retirement for us
Synonyms: guarantee / insure / assure / secure
ensure (v.)
be careful or certain to do something; make certain of something;
Synonyms: see / check / insure / see to it / control / ascertain / assure
From wordnet.princeton.edu