to ascertain
verb/kõʃ.tɐ.ˈtaɾ/medium
cons·ta·tar
Definition
To find out or learn with certainty; to verify or establish as a fact.
The police ascertained the identity of the witness.
We must ascertain the cause of the problem before proceeding.
Common collocations
ascertain the truthascertain the factsascertain the causedifficult to ascertain
Etymology
Do latim 'constatare', de 'constare' (estar firme, ser evidente).