What is the meaning of assure?

verb

• Make certain of.
  • usage: "This nest egg will ensure a nice retirement for us"; "Preparation will guarantee success"
  • synonyms: guarantee, ensure, insure, secure
• Inform positively and with certainty and confidence.
  • usage: "I tell you that man is a crook"
  • synonyms: tell
• Assure somebody of the truth of something with the intention of giving the listener confidence.
  • usage: "I assured him that traveling to Cambodia was safe"
• Be careful or certain to do something; make certain of something.
  • usage: "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product"
  • synonyms: see, check, insure, see to it, ensure, control, ascertain
• Cause to feel sure; give reassurance to.
  • usage: "The airline tried to reassure the customers that the planes were safe"
  • synonyms: reassure
• Make a promise or commitment.
  • synonyms: promise