Oxford Dictionary English

ascertain

verb
verb
BrE BrE//ˌæsəˈteɪn//
; NAmE NAmE//ˌæsərˈteɪn//
(formal)Verb Forms present simple I / you / we / they ascertain
BrE BrE//ˌæsəˈteɪn//
; NAmE NAmE//ˌæsərˈteɪn//
 he / she / it ascertains
BrE BrE//ˌæsəˈteɪnz//
; NAmE NAmE//ˌæsərˈteɪnz//
 past simple ascertained
BrE BrE//ˌæsəˈteɪnd//
; NAmE NAmE//ˌæsərˈteɪnd//
 past participle ascertained
BrE BrE//ˌæsəˈteɪnd//
; NAmE NAmE//ˌæsərˈteɪnd//
 -ing form ascertaining
BrE BrE//ˌæsəˈteɪnɪŋ//
; NAmE NAmE//ˌæsərˈteɪnɪŋ//
 Experiments and research
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to find out the true or correct information about something ascertain something It can be difficult to ascertain the facts. ascertain that… I ascertained that the driver was not badly hurt. it is ascertained that… It should be ascertained that the plans comply with the law. ascertain what, whether, etc… The police are trying to ascertain what really happened. Could you ascertain whether she will be coming to the meeting? it is ascertained what, whether, etc… It must be ascertained if the land is still owned by the government. Oxford Collocations DictionaryAscertain is used with these nouns as the object: authenticity, fact See full entry See related entries: Experiments and research Word Originlate Middle English (in the sense ‘assure, convince’): from Old French acertener, based on Latin certus ‘settled, sure’.
See ascertain in the Oxford Learner's Dictionary of Academic EnglishSee ascertain in the Oxford Advanced American Dictionary
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