"assure" in the verb sense
1. guarantee, ensure, insure, assure, secure
make certain of
"This nest egg will ensure a nice retirement for us"
"Preparation will guarantee success!"
2. assure, tell
inform positively and with certainty and confidence
"I tell you that man is a crook!"
assure somebody of the truth of something with the intention of giving the listener confidence
"I assured him that traveling to Cambodia was safe"
4. see, check, insure, see to it, ensure, control, ascertain, assure
be careful or certain to do something make certain of something
"He verified that the valves were closed"
"See that the curtains are closed"
"control the quality of the product"
5. reassure, assure
cause to feel sure give reassurance to
"The airline tried to reassure the customers that the planes were safe"
6. promise, assure
make a promise or commitment
Source: WordNet® (An amazing lexical database of English)
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