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ascertain

verb [T]
 
 
/ˌæs.əˈteɪn/ US  /-ɚ-/ formal

Definition

to discover something: The police have so far been unable to ascertain the cause of the explosion. [+ question word] Have you ascertained whether she's coming or not?Finding and discovering to make certain of something: [+ that] I ascertained that no one could overhear us before I told Otto the news.Finding and discovering
(Definition of ascertain verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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