from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To make sure or certain; insure: Our precautions ensured our safety. See Usage Note at assure.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To make sure. See insure.
- transitive v. To betroth.
from The Century Dictionary and Cyclopedia
- See insure.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. be careful or certain to do something; make certain of something
- v. make certain of
Middle English ensuren, from Anglo-Norman enseurer : Old French en-, causative pref.; see en-1 + Old French seur, secure, variant of sur; see sure.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Anglo-Norman enseurer, from Old French seur ("sure"). (Wiktionary)