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assure

as·sure [ ə shr ] (past and past participle as·sured, present participle as·sur·ing, 3rd person present singular as·sures)


transitive verb 
Definition:
 
1. convince somebody: to convince somebody of something
assured us of her sincerity

2. make somebody confident: to overcome somebody's doubt or disbelief about something
I can assure you that every word is true.

3. make something certain: to make something certain to happen
Proper planning assures that the job will be done right.

4. U.K. insure against certainty: to insure somebody against something that is certain to happen, e.g. death, rather than something that might happen, e.g. loss of or damage to property

[14th century. Via French assurer< assumed Vulgar Latin assecurare "make secure" < Latin securus (see secure)]

as·sur·a·ble adjective
as·sur·er noun

Word Usage
assure, ensure, or insure?

You use assure when you are referring to somebody else being made sure about something; insure is used chiefly in connection with insurance (that is, financial protection); ensure is a variant spelling for this but is also used when you are referring to something that you want to be sure of: I assure you it doesn't hurt.She wanted to ensure that it wouldn't hurt.I have insured my jewelry.

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