transitive verb Etymology: Middle English acertainen to inform, give assurance to, from Anglo-French acerteiner, from a- (from Latin ad-) + certein, certain certain Date: 15th century to make certain, exact, or precise, to find out or learn with certainty, see: discover ~able adjective ~ment noun
ASCERTAIN
Meaning of ASCERTAIN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012