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The Mayfield Handbook of Technical & Scientific Writing
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Usage Glossary: A B C D E F G H I K L M N O P Q R S T U V W Y

assure/ensure/insure

Assure means "to reinforce the likelihood that something is attained" or "to state convincingly." Ensure means "to make certain." Insure means "to guarantee monetary replacement in case of loss."


The use of a spectroscope assured us of a high level of accuracy.

The operator must ensure that Valves A and B are never open at the same time.

We insured the instrument for five thousand dollars.


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