Source : Webster's Revised Unabridged Dictionary (1913)

Psychologic \Psy`cho*log"ic\, Psychological \Psy`cho*log"ic*al\,
   a. [Cf. F. psychologique.]
   Of or pertaining to psychology. See Note under {Psychic}. --
   {Psy`cho*log"ic*al*ly}, adv.

Source : WordNet®

psychological
     adj 1: mental or emotional as opposed to physical in nature; "give
            psychological support"; "psychological warfare"
     2: of or relating to or determined by psychology;
        "psychological theories"