trait-n; 3 Senses

Sense Number 1: an observable, distinguishing characteristic

Commentary: TRAIT[+quality][+observable][+distinguishing]

Examples:
He was a letter-of-the-law man, a common trait in coaches.
A very dry wit is one of the author's most notable traits.

Mappings:
WordNet 3.0 Sense Numbers: 1

Sense Number 2: a genetically determined characteristic

Commentary: TRAIT[+quality][+determined][+genetically]

Examples:
Eye color is an inheritable trait.
This trait is recessive, and does not appear in most of the offspring.

Mappings:
WordNet 0.0 Sense Numbers: 1a

Sense Number 3: a stroke with pencil or pen

Commentary: TRAIT[+entity][+form][+stroke][+pencil]
NOTE: probably a rare usage

Examples:
Mary admired the delicate traits of the artist's pencil portraits.

Mappings:
WordNet 0.0 Sense Numbers: 1a