Definitions for: Longitudinally

[adv] with respect to longitude; "longitudinally measured"
[adv] in the direction of the length; "He cut the paper lengthwise"
[adv] across time; "We studied the development of the children longitudinally"

Webster (1913) Definition: Lon`gi*tu"di*nal*ly, adv.
In the direction of length.

Synonyms: lengthways, lengthwise, longways, longwise