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Motion detector


a device that is sensitive to movement, esp. used for security reasons or navigation aid; also called motion sensor

The motion detector turns on lights in the stairwell.


Read Also:

  • Motioned

    [moh-shuh n] /ˈmoʊ ʃən/ noun 1. the action or process of moving or of changing place or position; movement. 2. power of movement, as of a living body. 3. the manner of moving the body in walking; gait. 4. a bodily movement or change of posture; gesture. 5. a proposal formally made to a deliberative […]

  • Motion discomfort

    noun a feeling of discomfort induced by motion, but not quite motion sickness

  • Motionless

    [moh-shuh n-lis] /ˈmoʊ ʃən lɪs/ adjective 1. without : a motionless statue. /ˈməʊʃənlɪs/ adjective 1. not moving; absolutely still adj. 1590s, from motion (n.) + -less. Related: Motionlessly; motionlessness.

  • Motion-picture

    noun 1. a sequence of consecutive pictures of objects photographed in motion by a specially designed camera (motion-picture camera) and thrown on a screen by a projector (motion-picture projector) in such rapid succession as to give the illusion of natural movement. 2. a play, event, or the like, presented in this form. 3. motion pictures, […]

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