From HomoExcelsior

1. A quantity, such as velocity, completely specified by a magnitude and a direction. 2. A one-dimensional array. 3. An element of a vector space. 4. An organism, such as a mosquito or tick, that carries disease-causing microorganisms from one host to another. 5. A bacteriophage, a plasmid, or another agent that transfers genetic material from one location to another. 6. A force or an influence. 7. To guide (a pilot or an aircraft, for example) by means of radio communication according to vectors.