Noah Webster's Dictionary 1. (v. t.) To render (a person) certain; to cause to feel certain; to make confident; to assure; to apprise. 2. (v. t.) To make (a thing) certain to the mind; to free from obscurity, doubt, or change; to make sure of; to fix; to determine. 3. (v. t.) To find out or learn for a certainty, by trial, examination, or experiment; to get to know; as, to ascertain the weight of a commodity, or the purity of a metal.

Multi-Version Concordance Ascertain (5 Occurrences) Acts 22:24 the Tribune ordered him to be brought into the barracks, and be examined by flogging, in order to ascertain the reason why they thus cried out against him. (WEY DBY) Acts 23:28 Desiring to know the cause why they accused him, I brought him down to their council. (See NAS) Acts 24:8 By examining him yourself you may ascertain all these things of which we accuse him." (WEB NAS) Acts 24:11 For you have it in your power to ascertain that it is not more than twelve days ago that I went up to worship in Jerusalem; (WEY RSV) 1 Samuel 23:23 And see, and ascertain all the lurking-places where he hides himself, and come ye again to me with sure information, that I may go with you; and it shall come to pass, if he be in the land, that I will search him out throughout the thousands of Judah. (DBY)