ppl. a. [f. ASCERTAIN v. + -ED.] † a. Determined, fixed (obs.). b. Discovered by investigation, known.
1494. Fabyan, II. xxxiii. 26. So yt no tyme asserteyned, is to her deputed or set.
1858. Sears, Athan., xviii. 160. Professor Faraday considers it an ascertained fact.