"Traits" is one of the words most often used alongside, or in place of, "characteristics." The overlap is real, but "trait" carries a narrower, more specific sense that's worth understanding, particularly if you're reading psychology or biology content where the word gets used precisely.
Definitions
A characteristic is any distinguishing feature of a person, thing, or concept, a broad, general-purpose word. A trait is a specific, usually stable and heritable or deeply ingrained characteristic, most often used for personality or biological features that persist over time and across situations.
The key difference: scope
Characteristics is the broader umbrella term; traits sit underneath it as one particular kind of characteristic. Every trait is a characteristic, but not every characteristic is a trait. A car's top speed is a characteristic, but it isn't naturally called a trait, since "trait" is reserved almost entirely for living things and their persistent qualities.
Personality traits
This is where "trait" is used most precisely and most often. Psychology's Big Five model, covered on our Characteristics of Personality page, describes personality specifically as a set of traits, openness, conscientiousness, extraversion, agreeableness, and neuroticism, chosen because they hold up consistently over time and across situations, which is the defining feature of a trait in this context.
Physical traits
In biology, "trait" often refers specifically to an inherited physical feature, eye colour, blood type, height range, that's passed down genetically from parent to offspring. This is a more precise, technical use of the word than the everyday sense of "characteristic."
Behavioural traits
Traits also describe consistent behavioural tendencies, such as being naturally cautious or naturally sociable, when that tendency shows up reliably across many different situations rather than just once.
Scientific and biological context
In genetics specifically, a trait is a specific, definable characteristic of an organism, such as flower colour in a pea plant, that can be tracked across generations and linked to specific genes. This precise, technical usage is part of why "trait" carries a more scientific tone than the more general word "characteristic."
Examples in context
"The characteristics of the new phone include a faster processor and a larger screen", here "trait" would sound unnatural, since these aren't stable, inherited, or personality-linked. "Curiosity is one of her defining traits", here "characteristic" would still work but sounds slightly more clinical than "trait," which carries a stronger sense of persistent identity.
The takeaway
Characteristics is the general term for any distinguishing feature; traits is a more specific subset, generally used for stable personality qualities or inherited biological features. If you're describing something persistent about a person's character or genetics, "trait" is usually the more precise word; for everything else, "characteristic" remains the safer, broader choice.