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Classic usage
Reading level: hard
Estimated CEFR level: C1 — Advanced
Estimated from word frequency; not an official CEFR classification.
First attested in c. 1440, as a variant of Middle English ensuren (from Anglo-Norman enseurer, itself from en- + seür (“sure”), probably influenced by Old French asseürer (“to assure”)); took on its particular sense of "make safe against loss by payment of premiums" in 1635, replacing assure. Doublet of ensure.
see, check, see to it, ensure, control, ascertain, assure
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Classic usage
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