Webster 1913 Edition
[L., a bearer, carrier. fr.
vectum, to carry.]
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.
☞ 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
Webster 1828 Edition