verb (v)

• make certain of(verb.communication)

  Synonym:
  ensure, guarantee, insure, secure
  

  source: wordnet30
• inform positively and with certainty and confidence(verb.communication)

  Synonym:
  tell
  

  source: wordnet30
• assure somebody of the truth of something with the intention of giving the listener confidence(verb.communication)

  Example:
  I assured him that traveling to Cambodia was safe.
  

  source: wordnet30
• be careful or certain to do something; make certain of something(verb.cognition)

  Synonym:
  ascertain, check, control, ensure, insure, see, see to it
  

  source: wordnet30
• cause to feel sure; give reassurance to(verb.emotion)

  Example:
  The airline tried to reassure the customers that the planes were safe.
  

  Synonym:
  reassure
  Antonym:
  vex, worry
  

  source: wordnet30
• make a promise or commitment(verb.communication)

  Synonym:
  promise
  

  source: wordnet30
• To make sure or certain; to render confident by a promise, declaration, or other evidence.(verb)

  source: webster1913