ascertain meaning and definition

ASCERTAIN verb

Definition of ascertain (verb)

1. establish after a calculation, investigation, experiment, survey, or study
   • "find the product of two numbers"; "The physicist who found the elusive particle won the Nobel Prize"
   • synonyms: determine, find, find out
2. 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"
   • synonyms: assure, check, control, ensure, insure, see, see to it
3. find out, learn, or determine with certainty, usually by making an inquiry or other effort
   • "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"
   • synonyms: check, determine, find out, learn, see, watch
4. learn or discover with certainty