longitudinal
adjective
lon·gi·tu·di·nal
ˌlän-jə-ˈtüd-nəl 
-ˈtyüd-,
-ˈt(y)ü-dᵊn-əl,
British also ˌläŋ-gə-
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
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
Related article Weekend-only workouts may also be protecting your heart health
The scientists examined two sets of survey data from the Mexico City Prospective Study, a longitudinal study that followed the health of thousands of people in the Mexican capital over many years.
—
Lianne Kolirin, CNN, 30 Oct. 2024
Finally, this study does not take into account other confounding influences such as socioeconomic status and peer effects—an indication that the research on teen marijuana use should be done by using longitudinal studies to understand their trends.
—Dario Sabaghi, Forbes, 29 Oct. 2024
This includes longitudinal care coordination between PCPs and specialists, as well as navigators and patient advocates.
—Owen Tripp, Fortune, 23 Oct. 2024
Harvard Medical School researchers did a longitudinal study on 9845 preadolescents.
—Mark Travers, Forbes, 11 Oct. 2024
See all Example Sentences for longitudinal 
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Lianne Kolirin, CNN, 30 Oct. 2024
Finally, this study does not take into account other confounding influences such as socioeconomic status and peer effects—an indication that the research on teen marijuana use should be done by using longitudinal studies to understand their trends.
—Dario Sabaghi, Forbes, 29 Oct. 2024
This includes longitudinal care coordination between PCPs and specialists, as well as navigators and patient advocates.
—Owen Tripp, Fortune, 23 Oct. 2024
Harvard Medical School researchers did a longitudinal study on 9845 preadolescents.
—Mark Travers, Forbes, 11 Oct. 2024
See all Example Sentences for longitudinal
Dictionary Entries Near longitudinal
Cite this Entry
“Longitudinal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/longitudinal. Accessed 7 Nov. 2024.
Copy CitationKids Definition
longitudinal
adjective
lon·gi·tu·di·nal
ˌlän-jə-ˈt(y)üd-nəl
-ᵊn-əl
1
: of or relating to length
2
: placed or running lengthwise
longitudinally
adverb
-ē
Medical Definition
longitudinal
adjective
lon·gi·tu·di·nal
ˌlän-jə-ˈt(y)üd-ᵊn-əl, -nəl, British also ˌläŋ-gə-ˈtyüd-
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
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