1) in pathology. biotic or abiotic agent that transmits a pathogen. 2) in mechanics or rigging. quantity that has both a magnitude and a direction (e.g.. force) (see acceleration and velocity).

Merriam-Webster Online Dictionary
vector (noun)
a) a quantity that has magnitude and direction and that is commonly represented by a directed line segment whose length represents the magnitude and whose orientation in space represents the direction , broadly an element of a vector space
b) a course or compass direction especially of an airplane
a) an organism (as an insect) that transmits a pathogen
b) - pollinator
an agent (as a plasmid or virus) that contains or carries modified genetic material (as recombinant DNA) and can be used to introduce exogenous genes into the genome of an organism
vector (verb)
transitive verb
to guide (as an airplane, its pilot, or a missile) in flight by means of a radioed vector
to change the direction of (the thrust of a jet engine) for steering
vector (Wikipedia)

Vector may refer to:

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