Along lines of longitude, in the direction from pole to pole, meridianally. / (sciences and social sciences) By sampling data over time rather than merely once. / Lengthwise (rather than crosswise).

Relating to length, or to longitude. / Running in the direction of the long axis of a body. / Forward and/or backward, relative to some defined direction.

Any longitudinal piece, as in shipbuilding etc. / (rail transport) A railway sleeper lying parallel with the rail.

plural of longitudinal

The condition of being longitudinal (existing over a length of time)

A technique of creating magnetic data storage using horizontal as opposed to vertical magnetization of a hard disk drive.

plural of longitudinal aberration

(optics) Deviation from the correct point of focus measured parallel to the axis.

(physics) Any wave in which the direction of disturbance is parallel to the direction of travel.

plural of longitudinal wave