ratiocinate

verb

1. (intransitive, transitive)To use the powers of the mind logically and methodically; to reason.

   “"Observe the relative position," returned the Doctor with a smile. "It is your attitude to believe through thick and thin in one man's judgment—your own. I follow the same opinion, but critically and with open eyes. Which is the more irrational—I leave it to yourself." "Oh, my dear fellow!" cried Casimir, "[…] don't ratiocinate with me."”