lon·​gi·​tu·​di·​nal | \ ˌlän-jə-ˈtüd-nəl How to pronounce longitudinal (audio) , -ˈtyüd-, -ˈt(y)ü-dᵊn-əl, British also ˌläŋ-gə- \

Definition of longitudinal

1 : placed or running lengthwise The insect's back is black with yellow longitudinal stripes.
2 : of or relating to length or the lengthwise dimension the longitudinal extent of the building
3 : involving the repeated observation or examination of a set of subjects over time with respect to one or more study variables a longitudinal study of juvenile offenders over a period of five years

Other Words from longitudinal

longitudinally adverb

Examples of longitudinal in a Sentence

The insect's body is black with yellow longitudinal stripes. calculating the longitudinal position of a ship a longitudinal study of career aspirations among girls from 5 to 17
Recent Examples on the Web In my 15-year longitudinal study of over 3,200 leaders for my book, To Be Honest; Lead with the Power of Truth Justice & Purpose, one thing that repeatedly stood out was that successful leaders activated purpose through actions. Ron Carucci, Forbes, 7 May 2022 The study used data from Coronary Artery Risk Development in Young Adults (CARDIA), a prospective longitudinal study of Black and white men and women aged 18 to 30 years old. Christina Crawford, Health.com, 19 Apr. 2022 Founded in 2018, Valo has been working to develop its Opal platform, which combines artificial intelligence with longitudinal data from human patients. Alex Knapp, Forbes, 19 Jan. 2022 The study analyzed personalities of nearly 2,000 people who were participating in the Rush Memory and Aging Project, a longitudinal study of older Chicago-area adults that began in 1997. Sandee Lamotte, CNN, 11 Apr. 2022 In the 1980s, the husband-and-wife team of Arthur and Carol Kornhaber looked at 300 grandparent-grandchild pairs in a longitudinal study. Robin Marantz Henig, Scientific American, 4 Mar. 2022 The study used data from the UK Biobank, a longitudinal study of nearly a half a million UK adults designed to investigate how genetics and environment contribute to many common diseases. Sandee Lamotte, CNN, 21 Feb. 2022 Now an associate adjunct professor at the Alzheimer’s Disease Center at the University of California, Davis, Meyer is leading the country’s first longitudinal study into links between wartime trauma and dementia in the Vietnamese American community. NBC News, 25 Jan. 2022 According to a Businessolver longitudinal empathy study, only a quarter of employees believe that their companies exhibit sufficient empathy. Jan Bruce, Forbes, 18 Jan. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'longitudinal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of longitudinal

15th century, in the meaning defined at sense 2

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Time Traveler for longitudinal

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The first known use of longitudinal was in the 15th century

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Dictionary Entries Near longitudinal

longitude signal


longitudinal bulkhead

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Statistics for longitudinal

Last Updated

13 May 2022

Cite this Entry

“Longitudinal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/longitudinal. Accessed 6 Jul. 2022.

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More Definitions for longitudinal


lon·​gi·​tu·​di·​nal | \ ˌlän-jə-ˈtü-dᵊn-əl How to pronounce longitudinal (audio) , -ˈtyü- \

Kids Definition of longitudinal

: placed or running lengthwise longitudinal stripes

Other Words from longitudinal

longitudinally adverb


lon·​gi·​tu·​di·​nal | \ ˌlän-jə-ˈt(y)üd-ᵊn-əl, -nəl, British also ˌläŋ-gə-ˈtyüd- \

Medical Definition of longitudinal

1 : of, relating to, or occurring in the lengthwise dimension a longitudinal bone fracture
2 : extending along or relating to the anteroposterior axis of a body or part a trypanosome which reproduces by longitudinal fission
3 : involving the repeated observation or examination of a set of subjects over time with respect to one or more study variables (as general health, the state of a disease, or mortality) a longitudinal study of heart transplant recipients over a five-year period

Other Words from longitudinal

longitudinally \ -​ē How to pronounce longitudinal (audio) \ adverb

More from Merriam-Webster on longitudinal

Nglish: Translation of longitudinal for Spanish Speakers

Britannica English: Translation of longitudinal for Arabic Speakers


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