Forward and/or backward, relative to some defined direction.
Relating to length, or to longitude.
Running in the direction of the long axis of a body.
Sampling data over time rather than merely once.
Any longitudinal piece, as in shipbuilding etc.
A railway sleeper lying parallel with the rail.
at or forming a right angle (to something).
Exactly upright; extending in a straight line toward the centre of the earth, etc.
Independent of or irrelevant to each other; orthogonal.
A line or plane that is perpendicular to another.
A device such as a plumb line that is used in making or marking a perpendicular line.