- of or relating to longitude or length: longitudinal measurement.
- extending in the direction of the length of a thing; running lengthwise: a thin, longitudinal stripe.
- pertaining to or extending along the long axis of the body, or the direction from front to back, or head to tail.
- pertaining to a research design or survey in which the same subjects are observed repeatedly over a period of time.
- a longitudinal framing member, as in the hull of a ship.
- of or relating to longitude or length
- placed or extended lengthways
- (of a study of behaviour) carried on over a protracted period of time
