Please do not put on your Death List any usage that is approved by whatever dictionary you consider standard; you will confuse your students and turn them into Miss Thistlebottoms. (Reference to Theodore M. Bernstein, Miss Thistlebottom's Hobgoblins: The Careful Writer's Guide to the Taboos, Bugbears and Outmoded Rules of English Usage.
For example, if you use Webster's Third New International Dictionary, Unabridged:
Main Entry: in·sure ... 3 : ENSURE 3 intransitive verb : to contract to give insurance : UNDERWRITE; also : to procure or effect insurance synonym see ENSURE
no subject
Date: 2006-02-05 06:36 pm (UTC)For example, if you use Webster's Third New International Dictionary, Unabridged:
Main Entry: in·sure
...
3 : ENSURE 3
intransitive verb : to contract to give insurance : UNDERWRITE; also : to procure or effect insurance
synonym see ENSURE
"insure." Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002. http://unabridged.merriam-webster.com (5 Feb. 2006).