Merriam-Webster Collegiate Dictionary - mental

 I. adjective  Etymology: Middle English, from Late Latin ~is, from Latin ment-, mens mind — more at mind  Date: 15th century  1.  a. of or relating to the mind; specifically of or relating to the total emotional and intellectual response of an individual to external reality ~ health  b. of or relating to intellectual as contrasted with emotional activity  c. of, relating to, or being intellectual as contrasted with overt physical activity  d. occurring or experienced in the mind ; inner ~ anguish  e. relating to the mind, its activity, or its products as an object of study ; ideological  f. relating to spirit or idea as opposed to matter  2.  a.  (1) of, relating to, or affected by a psychiatric disorder a ~ patient ~ illness  (2) ~ly disordered ; mad, crazy  b. intended for the care or treatment of persons affected by psychiatric disorders ~ hospitals  3. of or relating to telepathic or mind-reading powers  • ~ly adverb  II. adjective  Etymology: Latin mentum chin — more at mouth  Date: circa 1727 of or relating to the chin ; genial