To find out definitely; to discover or establish. / (obsolete) To make (someone) certain or confident about something; to inform. / (archaic) To establish, to prove. / (archaic) To ensure or effect.

simple past tense and past participle of ascertain

present participle of ascertain

The act of ascertaining.

Able to be ascertained.

plural of ascertainment

Third-person singular simple present indicative form of ascertain

The state or quality of being ascertainable.

plural of ascertainer

One who, or that which, ascertains.