1. Adjective
Of or pertaining to longitude or length; as, longitudinal distance.
2. Adjective
Extending in length; in the direction of the length; running lengthwise, as distinguished from transverse; as, the longitudinal diameter of a body.
3. Noun
A railway sleeper lying parallel with the rail.
4. adjective
Studying change over time.
Following the same subjects or measures across an extended period.
5. Adjective
over an extended time; "a longitudinal study of twins"
Vocabulary classified under Research methods
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