What is the meaning of Longitudinal?

Relating to length.

Relating to the geographical longitude.

Running in the direction of the long axis of a body.

Forward and/or backward, relative to some defined direction.

Sampling data over time rather than merely once.

Any longitudinal piece, as in shipbuilding etc.

A railway sleeper lying parallel with the rail.

longitudinal (relating to length; running in the direction of the long axis of a body)

longitudinal (relating to longitude)

longitudinal (sampling data over time rather than merely once)

longitudinal

longitudinal (relating to length or longitude)

longitudinal (sampling data over time)

Source: wiktionary.org