longitudinal
/ˌlɔn.dʒɪˈtu.dɪ.nəl/ adjective C1- Running across a set direction of an object. · The motion about the longitudinal axis of an airplane is called roll.
- Running in the direction of the long axis of a body.
- Relating to the geographical longitude. · The longitudinal position of a ship refers to its angular distance east or west from the prime meridian.
- Of a study, sampling data over time rather than merely once. · longitudinal studies
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