( used with a singular verb ) Physics . the branch of mechanics that deals with the motion and equilibrium of systems under the action of forces, usually from outside the system.
( used with a plural verb ) the motivating or driving forces, physical or moral, in any field.
( used with a plural verb ) the pattern or history of growth, change, and development in any field.
( used with a plural verb ) variation and gradation in the volume of musical sound.
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