A unit of force equal to a mass of one avoirdupois pound times a standard acceleration of gravity, equal to about 4.44822 newtons. Symbol lbf or lb_f.

To cause something to be ejected / (baseball) To create an out by touching a base in advance of a runner who has no base to return to while in possession of a ball which has already touched the ground

In everyday understanding, the effect that tends to move an object away from the center of a circle it is rotating about (a consequence of inertia).

(mechanics) A parallelogram, two adjacent sides of which are vectors having the same initial point and representing two forces acting simultaneously upon this point, such that the resultant of the forces is given by the diagonal of the parallelogram that passes through this point.

(physics) Any of the fundamental forces that act between elementary particles; each one is associated with an exchanged particle.

(mechanics) A polygonal figure the sides of which are vectors representing several forces acting simultaneously upon one point, so that the vector necessary to make the figure closed is the resultant of those forces.

(physics) A very long-range, but relatively weak fundamental force of attraction that acts between all particles that have mass; believed to be mediated by gravitons.

An overwhelming force. / (law) An unavoidable catastrophe, especially one that prevents someone from fulfilling a legal obligation.

(military) The military units operating on the ground, including tanks, soldiers, artillery, etc.

(physics) A long-range fundamental force that acts between charged bodies, mediated by the exchange of photons.