longitudinal


lon·gi·tu·di·nal

adjective \ˌlän-jə-ˈtüd-nəl, -ˈtyüd-, -ˈt(y)ü-dən-əl, British also ˌläŋ-gə-\

: placed or going along the long side of something

: of or relating to longitude

: done by observing or examining a group of people or things over time to study how one or two particular things about them change

Full Definition of LONGITUDINAL

1
:  placed or running lengthwise
2
:  of or relating to length or the lengthwise dimension
3
:  involving the repeated observation or examination of a set of subjects over time with respect to one or more study variables
lon·gi·tu·di·nal·ly adverb

Examples of LONGITUDINAL

  1. The insect's body is black with yellow longitudinal stripes.
  2. calculating the longitudinal position of a ship
  3. a longitudinal study of career aspirations among girls from 5 to 17

First Known Use of LONGITUDINAL

15th century

lon·gi·tu·di·nal

adjective \ˌlän-jə-ˈt(y)üd-ən-əl, -nəl, British also ˌläŋ-gə-ˈtyüd-\   (Medical Dictionary)

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>
lon·gi·tu·di·nal·ly \-ē\ adverb

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