The Collaborative International Dictionary of English v.0.48:

Mentality \Men*tal"i*ty\, n.
   Quality or state of mind. "The same hard mentality."
   --Emerson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mentality
    n 1: a habitual or characteristic mental attitude that
         determines how you will interpret and respond to situations
         [syn: mentality, outlook, mindset, mind-set]
    2: mental ability; "he's got plenty of brains but no common
       sense" [syn: brain, brainpower, learning ability,
       mental capacity, mentality, wit]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "mentality":
   IQ, Vernunft, acuity, acumen, apprehension, attitude, bent, brain,
   brains, caliber, capacity, comprehension, conception,
   consciousness, deductive power, discourse of reason,
   discursive reason, disposition, esemplastic power, esprit,
   frame of mind, gray matter, head, headpiece, ideation, inclination,
   integrative power, intellect, intellection, intellectual faculty,
   intellectual grasp, intellectual power, intellectualism,
   intellectuality, intelligence, intelligence quotient, judgement,
   knowledge, mens, mental age, mental capacity, mental grasp,
   mental ratio, mind, mind-set, mother wit, native wit, nous,
   outlook, power of mind, power of reason, psyche, ratio,
   rationality, reason, reasoning, reasoning faculty, reasoning power,
   sanity, scope of mind, sense, smarts, temperament, thinking power,
   understanding, view, wise man, wit