(noun, adjective)


1. of or relating to lines of longitude

- longitudinal reckoning by the navigator

2. running lengthwise

- a thin longitudinal strip

- longitudinal measurements of the hull

Similar word(s): lengthways, lengthwise

3. over an extended time

- a longitudinal study of twins

Similar word(s): long


1. Any longitudinal piece, as in shipbuilding etc.

2. A railway sleeper lying parallel with the rail.