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.
A datum with more than one component. In physics, velocity has a direction and a magnitude. In computing, often refers to a block of data (as in Vector Processor) which might be pixels.
Any quantity, such as force velocity, or acceleration, which has both magnitude and direction at each point in space, as opposed to scalar which has magnitude only. Such a quantity may be represented geometrically by an arrow of length proportional to its magnitude, pointing in the assigned direction.