Traits refer to characteristic behaviors and feelings that are consistent and long lasting.
Other /More definition:
Traits refers to enduring or persistent characteristics of an individual that are independent of situations.
To Allport, Traits are the distinguishing characteristics that guide behavior. Traits are measured on a continuum and are subject to social, environmental, and cultural influences. To Cattell, Traits are reaction tendencies, derived by the method of factor analysis, that are relatively permanent parts of the personality.
List of books: Traits