Power derived from the motion of a horse.
Strength.
A nonmetric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts.
A metric unit (symbol often PS from the German abbreviation), approximately equal to 735.5 watts.
Of a body in motion: the tendency of a body to maintain its inertial motion; the product of its mass and velocity, or the vector sum of the products of its masses and velocities.
The impetus, either of a body in motion, or of an idea or course of events; a moment.