Dictionary.com

ascertain

[ as-er-teyn ]
/ ˌæs ərˈteɪn /
Save This Word!
See synonyms for: ascertain / ascertained / ascertaining / ascertainable on Thesaurus.com

verb (used with object)
to find out definitely; learn with certainty or assurance; determine: to ascertain the facts.
Archaic. to make certain, clear, or definitely known.
QUIZ
SPRINT TO THE FINISH WITH THIS OLYMPICS QUIZ!
Compete in our Olympics quiz to see if you can take home the gold medal in Olympics knowledge.
Question 1 of 10
Where was the Olympics first held?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of ascertain

1400–50; late Middle English, variant of assertain, acertain<Middle French acertain- (tonic stem of acertener to make certain), equivalent to a-a-5 + certaincertain

OTHER WORDS FROM ascertain

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use ascertain in a sentence

British Dictionary definitions for ascertain

ascertain
/ (ˌæsəˈteɪn) /

verb (tr)
to determine or discover definitely
archaic to make certain

Derived forms of ascertain

ascertainable, adjectiveascertainably, adverbascertainment, noun

Word Origin for ascertain

C15: from Old French acertener to make certain
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
FEEDBACK