/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,”