• Trait, a characteristic or property of some object
• Trait (biology)
  Trait (biology)
  A trait is a distinct variant of a phenotypic character of an organism that may be inherited, environmentally determined or be a combination of the two...
  
  , which involve genes and characteristics of organisms
• Trait theory
  Trait theory
  In psychology, Trait theory is a major approach to the study of human personality. Trait theorists are primarily interested in the measurement of traits, which can be defined as habitual patterns of behavior, thought, and emotion. According to this perspective, traits are relatively stable over...
  
  , an approach to the psychological study of personality
• Trait (computer programming), a model for structuring object-oriented programs
• Traits class, a template class in the C++ programming language

Entertainment

• Trait (album)
  Trait (album)
  Trait is the first and only EP by the industrial rock/metal band Pailhead. The original EP was released in 1988, containing the first four songs in a slightly different order...
  
  , the first and only EP by the industrial rock/metal band Pailhead
• Trait (role-playing games), a type of role-playing statistic