From Longman Dictionary of Contemporary EnglishRelated topics: Geographylongitudinallon‧gi‧tu‧di‧nal /ˌlɒndʒɪˈtjuːdɪnəl◂ $ ˌlɑːndʒɪˈtuː-/ adjective technical1PERIOD OF TIMErelating to the development of something over a period of timelongitudinal study/survey/research etca longitudinal study of unemployed workers2LONGgoing from top to bottom, not acrosslongitudinal stripes3SGmeasuredaccording to longitude —longitudinally adverbExamples from the Corpuslongitudinal• Most agree that there is considerablemerit in using the longitudinalapproach Piaget used.• Musclestrips were mounted with the longitudinalaxisparallel to the direction of the circular muscle bundles.• Unfortunately, with a commendableshift to shreddingappraisals after three or five years, such longitudinal data may be non-existent.• longitudinal muscles• Before leaving the topic of longitudinal studies, it is worthpointing out that the Census can be seen as an example.• There are few longitudinal studies which have published data describing changes in the ability to undertakespecific adl activities over time.• Recognising this problem led scholars in the area to make the first serious use of what are called longitudinal studies.longitudinal study/survey/research etc• Equally conflicting results with regard to glycaemic control and platelet-specific proteinlevels have been reported in longitudinal studies.• Recognising this problem led scholars in the area to make the first serious use of what are called longitudinal studies.• While this longitudinal study is one of the most famous, it is by no means the only one.• Before leaving the topic of longitudinal studies, it is worth pointing out that the Census can be seen as an example.• Undertaken by the National Children's Bureau, this is a longitudinal study of breathtakingscale and thoroughness.• Essentially, this is a longitudinal study of one subject.• It is a longitudinal study - the initialvisit being in February 1983 and the final visit in January 1985.• Finally, researchevidence, particularly longitudinal studies which relate children's present situations to futureoutcomes, will increasingly influencepractice.