The Collaborative International Dictionary of English v.0.48:

Trait \Trait\, n. [F., fr. L. tractus, fr. trahere to draw. See
   Trace, v., and cf. Tract a region, Trace a strap,
   Tret.]
   [1913 Webster]
   1. A stroke; a touch.
      [1913 Webster]

            By this single trait Homer makes an essential
            difference between the Iliad and Odyssey. --Broome.
      [1913 Webster]

   2. A distinguishing or marked feature; a peculiarity; as, a
      trait of character.
      [1913 Webster]

   Note: Formerly pronounced tr[=a], as in French, and still so
         pronounced to some extent in England.
         [1913 Webster]

WordNet (r) 3.0 (2006):

trait
    n 1: a distinguishing feature of your personal nature

Moby Thesaurus II by Grady Ward, 1.0:

117 Moby Thesaurus words for "trait":
   acculturation, affection, air, aroma, attribute, badge, banner,
   bearing, birthmark, brand, brow, cachet, carriage, cast,
   cast of countenance, character, characteristic, civilization,
   color, complex, complexion, configuration, countenance,
   cultural drift, culture, culture area, culture center,
   culture complex, culture conflict, culture contact,
   culture pattern, culture trait, cut, demeanor, denominator, device,
   differentia, differential, distinctive feature, earmark, ethos,
   face, facial appearance, favor, feature, features, figure, flavor,
   folkways, garb, guise, gust, hallmark, idiocrasy, idiosyncrasy,
   image, impress, impression, index, indicant, indicator,
   individualism, insignia, key trait, keynote, lineaments, lines,
   looks, mannerism, mark, marking, measure, mien, mold, mores,
   nature, note, odor, particularity, peculiarity, physiognomy,
   picture, point, port, posture, presence, property, quality, quirk,
   representation, representative, savor, seal, shape, sigil, sign,
   signal, signature, singularity, smack, society, specialty, stamp,
   stance, sure sign, symptom, taint, tang, taste, telltale sign,
   token, trait-complex, traits, trick, turn, virtue, visage