ascertain - definition and synonyms

verb [intransitive/transitive] formal 

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present tense
present participleascertaining
past tenseascertained
past participleascertained
  1. to find out something

    Police are trying to ascertain the facts of the case.

    ascertain whether/what/how etc:

    We need to ascertain whether the project is feasible.

    ascertain that:

    The police have ascertained that he knew the victim.

    ascertain from:

    This much could easily be ascertained from the newspapers.

    ascertain the cause/nature/extent of something:

    Experts were unable to ascertain the cause of the accident.