To prove to be true; to vouch for; to verify; to ascertain. Obsolete. rare.

transitive. To ordain, decree; to appoint; to decide. Obsolete.

To get (information, evidence, etc.) by inquiry, questioning, or examination. Also: to ascertain (a fact) by such methods.

transitive. To make (a thing) certain to the mind; to render certain what or which it is. archaic.

transitive. To make certain; to certify.

Of a circumstance, fact, etc.: To lend confirmation or support to (a belief, doctrine, rarely, a person); to point in the direction of.

To render stable or firm. To ratify, confirm, validate. Obsolete.

To ascertain the truth or right of (a matter, a quarrel, etc.) by test or endeavour; with out, to thrash or fight out; to determine. Now rare.

To extract (oil) from blubber or fat by heat; to melt down (blubber, etc.), to obtain the oil; to render; also, to extract (wax) from a honey-comb…

(figurative from 1b or 1d.) To make sure, confirm, ratify; to ‘knit’, ‘cement’. ? Obsolete.

transitive. To assure (a person) of a fact. Also as an asseveration in I'll secure you. Obsolete.

Followed by a clause or of: to make oneself certain that something specified is the case; to ascertain something.

transitive. To prove true, verify. Obsolete. rare.

transitive. To ascertain definitely by observation, examination, calculation, etc. (a point previously unknown or uncertain); to fix as known.

To ascertain definitely.

transitive. With as. To verify (something) as the thing it is supposed or believed to be.

transitive. To establish, ascertain, state.

To establish by investigation.

To examine for incorrectness or bias; to confirm or check the correctness of.