- 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