ensure
( ensures 3rd person present) ( ensuring present participle) ( ensured past tense & past participle ) To ensure something, or to ensurethat something happens, means to make certain that it happens.
FORMAL verb
Britain's negotiators had ensured that the treaty which resulted was a significant change in direction... V that
...the President's Council, which ensures the supremacy of the National Party. V n
Translation English - Cobuild Collins Dictionary  

ensure , insure
1 certify, confirm, effect, guarantee, make certain, make sure, secure, warrant
2 guard, make safe, protect, safeguard, secure
English Collins Dictionary - English synonyms & Thesaurus

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"