Definition of ascertain verb from the Oxford Advanced American Dictionary

 

ascertain

 verb
verb
NAmE//ˌæsərˈteɪn//
 
(formal)Verb Forms present simple I / you / we / they ascertain
 
he / she / it ascertains
 
past simple ascertained
 
-ing form ascertaining
 
 
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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.
ascertainable
 
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NAmE//ˌæsərˈteɪnəbl//
 
adjective
ascertainmentnoun[uncountable]
 
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See the Oxford Advanced Learner's Dictionary entry: ascertain