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a coordinate system that can be used to define motion. A frame of refrence is a set of points with respect to which we can measure the instantanious position of a particle or of a system of particles. that particle or system ofparticle may be either in motion or at rest. . A structure of concepts, values, customs, or views by means of which an individual or group perceives or evaluates data, communicates ideas, and regulates behavior.[Edit this definition]
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