WordWeb Online

1. Make certain of
   - guarantee, ensure, insure, secure
    
2. Inform positively and with certainty and confidence
   - tell
    
3. Assure somebody of the truth of something with the intention of giving the listener confidence
   "I assured him that travelling to Cambodia was safe"
    
4. Be careful or certain to do something; make certain of something
   - see, check, insure, see to it, ensure, control, ascertain
    
5. Cause to feel sure; give reassurance to
   - reassure
    
6. Make a promise or commitment
   - promise

Derived forms: assured, assuring, assures

See also: assurance

Type of: affirm, assert, aver, avow, calm, calm down, declare, lull, persuade, quiet, quieten, still, swan, swear, tranquilize [N. Amer], tranquillise [Brit], tranquillize, verify