longitudinal

/ˌlɔːndʒɪˈtuːdɪnəl/
adjective
  1. Relating to length or the long direction of something.
    • Scientists made longitudinal cuts through the tree trunk to study its rings.
    • The bridge has longitudinal beams that run from one end to the other.
    • The car's longitudinal engine is mounted along the length of the vehicle.
  2. Relating to a study or research that follows the same subjects over a long period of time.
    • A longitudinal study tracked the health of 10,000 people for 20 years.
    • The university conducted a longitudinal survey on job satisfaction among graduates.
    • Longitudinal research helps scientists understand how children develop over time.
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What does "longitudinal" mean? | whatsthatwordmean | whatsthatwordmean