9 letters · 11 points in Scrabble
verb establish after a calculation, investigation, experiment, survey, or study
verb be careful or certain to do something; make certain of something
verb find out, learn, or determine with certainty, usually by making an inquiry or other effort
originFrom Middle English acerteynen, from Old French acertener, from a- (“to, towards”) + certener (“make sure of”), from the adjective certain, from Latin certus (“certain, fixed”). Compare to Spanish acertar.
Etymology from Wiktionary, CC BY-SA 3.0