In the quaternion analysis, a quantity that has magnitude, but not direction; -- distinguished from a vector, which has both magnitude and direction.
- A quantity, such as mass, length, or speed, that is completely specified by its magnitude and has no direction.
- Mathematics A number, numerical quantity, or element in a field.
- A device that yields an output equal to the input multiplied by a constant, as in a linear amplifier.
- Of or relating to a scalar.