/ ˈvektə(r); NAmE / noun
1.
( mathematics ) a quantity that has both size and direction :
Acceleration and velocity are both vectors.
—compare scalar
2.
( biology ) an insect, etc. that carries a particular disease from one living thing to another
3.
( technical ) a course taken by an aircraft
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WORD ORIGIN
mid 19th cent.: from Latin , literally carrier , from vehere convey.