ascertain
ascertain /ˌæs.əˈteɪn/ aep /-ɚ-/ verb [T] FORMAL ↑Verb Endings for ascertain
1 F0 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?Thesaurus+: ↑Finding and discovering2 F0 to make certain of something: » [+ that] I ascertained that no one could overhear us before I told Otto the news.Thesaurus+: ↑Finding and discovering |