ascertain

[ as-er-teyn ]
/ ˌæs ərˈteɪn /

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.

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 + certain certain

Related forms

Synonym study

1. See learn.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ascertain

British Dictionary definitions for ascertain

ascertain

/ (ˌæsəˈteɪn) /

verb (tr)

to determine or discover definitely
archaic to make certain

Derived Forms

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