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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 say it’s the first large-scale longitudinal cancer study focused on Asian Americans.

From Los Angeles Times • Jun. 6, 2026

Although we had decades of clinical data validating its effectiveness, it was an observation from a longitudinal study of healthy nurses in the 1980s that spurred the largest bump in hormone usage.

From MarketWatch • May 12, 2026

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

From The Wall Street Journal • Mar. 27, 2026

To study these patterns over time, the researchers analyzed longitudinal data from the national Health and Retirement Study.

From Science Daily • Dec. 19, 2025

Figure 3.11: The standing waves in the tubes are actually longitudinal sound waves.

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



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