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1. (noun) vector
a variable quantity that can be resolved into components
2. (noun) vector
a straight line segment whose length is magnitude and whose orientation in space is direction
3. (noun) vector, transmitter
any agent (person or animal or microorganism) that carries and transmits a disease
"mosquitos are vectors of malaria and yellow fever"; "fleas are vectors of the plague"; "aphids are transmitters of plant diseases"; "when medical scientists talk about vectors they are usually talking about insects"
4. (noun) vector
(genetics) a virus or other agent that is used to deliver DNA to a cell
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Definition of 'vector' 
