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
Echoing these results, anthropologist Riana Minocher and her colleagues recently published a study that uses a detailed, longitudinal dataset from a 20-year prospective study in another region of Tanzania.
—
David W. Lawson, The Conversation, 21 Oct. 2025
The report also offers one of the most comprehensive longitudinal views of CEO sentiment on sustainability, just as the UN Global Compact enters its 25th year, the organizations said.
—Jasmin Malik Chua, Sourcing Journal, 8 Oct. 2025
Elise Christopher oversaw the high school longitudinal studies at the National Center for Education Statistics, part of the Institute of Education Sciences, until she was laid off in March along with dozens of her colleagues.
—Carmela Guaglianone, NPR, 7 Oct. 2025
Exchange Relationships In the massive longitudinal study, Park and his colleagues followed more than 7,000 couples over the course of 13 years.
—Mark Travers, Forbes.com, 18 Sep. 2025
See All Example Sentences for longitudinal
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David W. Lawson, The Conversation, 21 Oct. 2025
The report also offers one of the most comprehensive longitudinal views of CEO sentiment on sustainability, just as the UN Global Compact enters its 25th year, the organizations said.
—Jasmin Malik Chua, Sourcing Journal, 8 Oct. 2025
Elise Christopher oversaw the high school longitudinal studies at the National Center for Education Statistics, part of the Institute of Education Sciences, until she was laid off in March along with dozens of her colleagues.
—Carmela Guaglianone, NPR, 7 Oct. 2025
Exchange Relationships In the massive longitudinal study, Park and his colleagues followed more than 7,000 couples over the course of 13 years.
—Mark Travers, Forbes.com, 18 Sep. 2025
See All Example Sentences for longitudinal
Cite this Entry
“Longitudinal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/longitudinal. Accessed 30 Oct. 2025.
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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