Past tense of ensure; made certain that something would occur or be the case. Guaranteed or secured a particular outcome.
From Old French 'enseurer', from 'en-' (in) plus 'seur' (sure), ultimately from Latin 'securus' (secure). The word entered English in the 14th century with the meaning of making safe or certain.
The subtle difference between 'ensure', 'insure', and 'assure' reveals how English speakers think about certainty - we ensure outcomes, insure against risks, and assure people, showing distinct cognitive categories for different types of security.
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