LONGITUDINALLY
longitudinally
(adverb) with respect to longitude; “longitudinally measured”
lengthways, lengthwise, longwise, longways, longitudinally
(adverb) in the direction of the length; “He cut the paper lengthwise”
longitudinally
(adverb) across time; “We studied the development of the children longitudinally”
Source: WordNet® 3.1
Etymology
Adverb
longitudinally (comparative more longitudinally, superlative most longitudinally)
Along lines of longitude, in the direction from pole to pole, meridianally.
(science and social science) By sampling data over time rather than merely once.
Source: Wiktionary
Lon`gi*tu"di*nal*ly, adv.
Definition: In the direction of length.
LONGITUDINAL
Lon`gi*tu"di*nal, a. Etym: [Cf. F. longitudinal.]
1. Of or pertaining to longitude or length; as, longitudinal
distance.
2. Extending in length; in the direction of the length; running
lengthwise, as distinguished from transverse; as, the longitudinal
diameter of a body. Cheyne.
Lon`gi*tu"di*nal, n.
Definition: A railway sleeper lying parallel with the rail.
Source: Webster’s Unabridged Dictionary 1913 Edition