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Definitions

longitudinal

[lon-ji-tood-n-l, -tyood-] / ˌlɒn dʒɪˈtud n l, -ˈtyud- /
ADJECTIVE
over a protracted period of time; running lengthwise
Synonyms
Antonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Researchers observed the same trend in a longitudinal metabolomic analysis, which follows people over time and uses advanced blood testing to examine hundreds of tiny molecules that reflect how the body is functioning.

From Science Daily • May 16, 2026

More longitudinal studies will be needed to build on the research, but could eventually lead to different tests and treatment options for men and women.

From MarketWatch • Apr. 13, 2026

A 2026 longitudinal study in the Journal of Public Health reached a similar conclusion.

From The Wall Street Journal • Mar. 27, 2026

Marc was accepted into AllFTD, a longitudinal study that is the largest ever conducted for this disease.

From Los Angeles Times • Sep. 7, 2025

But the wave inside a tube, since it is a sound wave already, is a longitudinal wave; the waves do not go from side to side in the tube.

From "Understanding Basic Music Theory" by Catherine Schmidt-Jones and Russel Jones



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