Ascertain

1. verb

   find out, learn, or determine with certainty, usually by making an inquiry or other effort

   “I want to see whether she speaks French”

   Similar: determine, check, find out, see, watch, learn

2. verb

   establish after a calculation, investigation, experiment, survey, or study

   “find the product of two numbers”

   Similar: determine, find, find out

3. verb

   be careful or certain to do something; make certain of something

   “He verified that the valves were closed”

   Similar: see, check, insure, see to it, ensure, control

4. verb

   learn or discover with certainty