Definition of vector noun from the Oxford Advanced Learner's Dictionary
vector
noun
ˈvektə(r) ˈvektər
1(mathematics) a quantity that has both size and directionAcceleration and velocity are both vectors. compare scalar2(biology) an insect, etc. that carries a particular disease from one living thing to anotherMosquitoes are the vectors in malaria.3(technical) a course taken by an aircraft