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longitudinal

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longitudinal/ˌlɑːnʤəˈtuːdənəl/
British/ˌlɒnʤəˈtjuːdənəl/adjective
longitudinal
/ˌlɑːnʤəˈtuːdənəl/British/ˌlɒnʤəˈtjuːdənəl/
adjective
Learner's definition of LONGITUDINAL  
always used before a noun
: placed or going along the long side of something
: of or relating to longitude
: done by observing or examining a group of people or things over time to study how one or two particular things about them change

— longitudinally

adverb
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