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Longitudinal is a geometric term of location which may refer to:

  • Longitude
    • Line of longitude, also called a meridian
  • Longitudinal engine, an internal combustion engine in which the crankshaft is oriented along the long axis of the vehicle, front to back
  • Longitudinal mode, a particular standing wave pattern of a resonant cavity formed by waves confined in the cavity
  • Longitudinal redundancy check, in telecommunication, a form of redundancy check that is applied independently to each of a parallel group of bit streams.
  • Longitudinal study, a research study that involves repeated observations of the same items over long periods of time — often many decades
  • Longitudinal voltage, in telecommunication, a voltage induced or appearing along the length of a transmission medium
  • Longitudinal wave, a wave with oscillations or vibrations along or parallel to their direction of travel
  • Longitudinal/longitudinally are also anatomical terms of location.

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