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change in position of an object over time; a body is said to be in motion if it changes its position or orientation with respect to its immediate surroundings From Wikiquote, the free quote compendium
Motion, in physical terms, refers to changes of position of an object with respect to time and some spacial reference points, typically observed and described by measures of displacement, direction, velocity, acceleration, as well as general regions of time and spatial locality. The term can also signify a continuous changes in the configurations of a physical system involving waves or quantum particles and the probabilities of these occupying specific positions. It is also used to refer to formal political procedures of legislative motions, including parliamentary motions, as well as legal motions. Move and Movement are related words for either initiating or sustaining any of these types of physical or formal "motion", but which is also used in reference to influences upon emotional states as well.
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