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La Le Li Lo Lu Ly
Lob Loc Loi Lon Loo Lov

Longitudinal

/ˌlänjəˈt(y)o͞odn-əl/  /ˌlôn-/  /-ˈt(y)o͞odnəl/

Adjective

1. Relating to length, or to longitude. (wiktionary.org)

2. Running in the direction of the long axis of a body. (wiktionary.org)

3. Forward and/or backward, relative to some defined direction. (wiktionary.org)

4. (Sciences and social sciences, of a study) Sampling data over time rather than merely once. (wiktionary.org)

Word origin: From Latin longitudo, “length, duration,” from longus, from Old English lang “long,”