Webster's English Dictionary

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vector

1. vec.tor \'vek-t*r\ \vek-'to-r-e--*l, -'to.r-\ n [NL, fr. L, carrier, fr. 
   vectus, pp. of vehere to carry - more at] WAY 1a: a quantity that has 
   magnitude, direction, and sense and that is commonl y represented by a 
   directed line segment whose length represents the magnitude and whose 
   orientation in space represents the direction 1b: a course or compass 
   direction esp. of an airplane  2: an organism (as an insect) that transmits 
   a pathogen  3: DRIVE  - vec.to.ri.al aj
2. vector \-t(*-)rin\ vt or vec.tor.ing : to guide (as an airplane, its 
   pilot, or a missile) in flight by means o f a radioed vector