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1 | noun | an instance of change; the rate or magnitude of change 2 | noun | an activity that varies from a norm or standard 3 | noun | a repetition of a musical theme in which it is modified or embellished 4 | noun | something a little different from others of the same type 5 | noun | an artifact that deviates from a norm or standard 6 | noun | the angle (at a particular location) between magnetic north and true north 7 | noun | the process of varying or being varied 8 | noun | (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon) (11 meanings)