ascertain

Verb
  1. Establish after a calculation, investigation, experiment, survey, or study (synset 200920843)
    "find the product of two numbers"; "The physicist who found the elusive particle won the Nobel Prize"
  2. Be careful or certain to do something;
    Make certain of something (synset 200664507)
    "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product"
  3. Find out, learn, or determine with certainty, usually by making an inquiry or other effort (synset 200922307)
    "I want to see whether she speaks French"; "See whether it works"; "find out if he speaks Russian"; "Check whether the train leaves on time"
  4. Learn or discover with certainty (synset 200723226)

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