Longitudinal

Pronunciation

• RP IPA: /ËŒlɒŋɡɪˈtjuːdɪnl/
• GenAm IPA: /ËŒlÉ‘ndʒəˈtuːdÉ™nÉ™l/
• Australia IPA: /lɒŋɡəˈtjuːdÉ™nÉ™l/

Origin

From Latin longitūdin-, oblique stem of longitūdō ("length, longitude") (whence also longitude), and the suffix + -al.

Adjective

1. Relating to length, or to longitude.
2. Running in the direction of the long axis of a body.
3. Forward and/or backward, relative to some defined direction.
4. (science and social science, of a study) Sampling data over time rather than merely once.

Antonyms

• (relating to length) transverse
• (sampling data over time) cross-sectional

Full definition of longitudinal

Noun

1. Any longitudinal piece, as in shipbuilding etc.
1. A railway sleeper lying parallel with the rail.----