ascertain

verb

1.
establish after a calculation, investigation, experiment, survey, or study
circlewyrd determine find find out
Derived from:
ascertainable
2.
be careful or certain to do something; make certain of something
sickerput weir 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
check determine find out learn see watch
Derived from:
ascertainable
4.
learn or discover with certainty
Derived from:
ascertainable