American English

Definition of ascertain verb from the Oxford Advanced American Dictionary



(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.
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ascertainment noun [uncountable]
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See the Oxford Advanced Learner's Dictionary entry: ascertain