"longitudinally" in the adverb sense
1. longitudinally
across time
"We studied the development of the children longitudinally"
2. lengthways, lengthwise, longwise, longways, longitudinally
in the direction of the length
"He cut the paper lengthwise"
3. longitudinally
with respect to longitude
"longitudinally measured"
Source: WordNet® (An amazing lexical database of English)
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