Definition of ascertain verb from the Oxford Advanced Learner's Dictionary

 

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. See related entries: Experiments and research Word Origin late Middle English (in the sense ‘assure, convince’): from Old French acertener, based on Latin certus ‘settled, sure’.
See the Oxford Advanced American Dictionary entry: ascertain