noun Physiology.

  1. the movement of an organism in response to a stimulus, as light.

  1. a combining form with the general sense “movement, activity,” used in the formation of compound words, often with the particular senses “reaction to a stimulus” (photokinesis), “movement without an apparent physical cause” (telekinesis), “activity within a cell” (karyokinesis).


  1. biology the nondirectional movement of an organism or cell in response to a stimulus, the rate of movement being dependent on the strength of the stimulus

“physical movement,” 1819, from Greek kinesis “movement, motion” (see cite).

n. pl. ki•ne•ses (-sēz′)

  1. Motion or physical movement, especially movement that is induced by stimulation.

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