Look up longitudinal in Wiktionary, the free dictionary.
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.
 
See also
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