- Biol. an animal, esp. an insect, that transmits a disease-producing organism from a host to an uninfected animal or plant
- Math.
- a mathematical expression denoting a combination of magnitude and direction, as velocity
- a directed line segment representing such an expression
- an ordered set of real numbers, each denoting a distance on a coordinate axis
- the particular course followed or to be followed, as by an aircraft; compass heading
Origin of vector
Modern Latin from L, bearer, carrier from vectus, past participle of vehere, to carry: see way