#motion  a state of change; "they were in a state of steady motion"
  exclusion:  motionlessness
  supertype:  movement__motion  a natural event that involves a change in the position or location of something
  subtype:  shakiness__shakines__trembling__quiver__quivering__vibration__palpitation  a shaky motion; "the shaking of his fingers as he lit his pipe"
     subtype:  tremolo.shakiness  (music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones
     subtype:  tremor  shaking or trembling (usually resulting from weakness or stress or disease)
        subtype:  essential_tremor__essentialtremor  tremor of unknown cause (usually of the hands and head) that develops in older people; often mistaken for Parkinsonism but is not life-threatening and can usually be kept under control
  subtype:  perpetual_motion__perpetualmotion  motion that continues indefinitely without any external source of energy; impossible in practice because of friction
  subtype:  precession  the motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone
  subtype:  stream.motion__flow  something that resembles a flowing stream in moving continuously; "a stream of people emptied from the terminal"; "the museum had planned carefully for the flow of visitors"

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