Trait
Trait may refer to:

Phenotypic trait in biology, which involve genes and characteristics of organisms
Genotypic trait, sometimes but not always presenting as a phenotypic trait
Personality, traits that predict an individual's behavior.
Trait theory in psychology
Trait (computer programming), a model for structuring object-oriented programs (a template class in the C++ programming language)

Entertainment
Trait (album), the first and only EP by the industrial rock/metal band Pailhead
Traits (Joe Morris album)
Trait (role-playing games), a type of role-playing statistic