sca·lar 
(skālər, -lär′)
(skālər, -lär′)n.
1.
a. A quantity, such as mass, length, or speed, that is completely specified by its magnitude and has no direction.
b. Mathematics A number, numerical quantity, or element in a field.
2. A device that yields an output equal to the input multiplied by a constant, as in a linear amplifier.
adj.
Of or relating to a scalar.
[Latin scālāris, of a ladder, from scālae, ladder; see SCALE2.]