vec·tor /ˈvɛktɚ/ 名詞
1. Same as Radius vector.
2. Math. A directed quantity, as a straight line, a force, or a velocity. Vectors are said to be equal when their directions are the same and their magnitudes equal. Cf. Scalar.
Note: ☞ In a triangle, either side is the vector sum of the other two sides taken in proper order; the process finding the vector sum of two or more vectors is vector addition (see under Addition).
n 1: a variable quantity that can be resolved into components
2: a straight line segment whose length is magnitude and whose
orientation in space is direction
3: 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" [syn: transmitter]