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Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Movement or activity of an organism in response to a stimulus such as light.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the movement of an organism in response to an external stimulus

from The Century Dictionary and Cyclopedia

  • n. Any manifestation of dynamic energy.
  • n. In cytology, a short expression for karyokinesis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation

Etymologies

Greek kīnēsis, movement, from kīnein, to move; see kei-2 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κίνησις (kinēsis, "motion, movement"). (Wiktionary)

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