Assure means "to promise," "to reassure," or "to convince."

Ensure and insure both mean "to make sure or certain," but only insure is widely used in the sense of guaranteeing the value of life or property.

I assure you that the paper will be done on time.

We need a complete bibliography to ensure that the information is complete.

This paper is so good it ought to be insured against theft.

 

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