/ ˌlɒŋgɪˈtjuːdɪnl; ˌlɒndʒɪ-; NAmE ˌlɑːndʒəˈtuːdnl/ adjective ( technical )
1.
going downwards rather than across :
The plant's stem is marked with thin green longitudinal stripes.
2.
concerning the development of sth over a period of time :
a longitudinal study of aging
3.
connected with longitude :
the town's longitudinal position
► lon·gi·tu·din·al·ly / -nəli; NAmE / adverb