adjective

longitudinal

longitudinal, lengthwise

The car has a longitudinal engine.

The car has a longitudinal engine.

They conducted a longitudinal study over ten years.

They conducted a longitudinal study over ten years.

a longitudinal ((noun)) relating to length or the lengthwise dimension A longitudinal study can be very expensive.

Synonyms: lengthwise, linear; Antonyms: latitudinal, transverse

From 'longitude' + '-al' (adjective suffix). Relating to length or longitude.

It describes something that runs along the 'long' axis or over a 'long' period of time.

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