Use the adjective longitudinal to describe something that takes place over a long period of time, like a study of the lifetime eating habits of people who live on islands. Sociologists and other scientists use …

A longitudinal study (or longitudinal survey, or panel study) is a research design that involves repeated observations of the same variables (e.g., people) over long periods of time (i.e., uses longitudinal data).

The meaning of LONGITUDINAL is placed or running lengthwise. How to use longitudinal in a sentence.

A longitudinal line or structure goes from one end of an object to the other rather than across it from side to side. That stability lends itself to longitudinal analysis. Collins COBUILD Advanced Learner’s …

Definition of longitudinal adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Mar 7, 2026 · Longitudinal research tracks the same people over time to reveal how things change. Learn how it works, its types, real examples, and key challenges.

1. of or pertaining to longitude or length: longitudinal measurement. 2. extending in the direction of the length of a thing; lengthwise. 3. of or extending along the long axis of the body, or the direction from …

longitudinal, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

The Framingham study is widely recognised as the quintessential longitudinal study in the history of medical research. An original cohort of 5,209 subjects from Framingham, Massachusetts between …

Feb 11, 2026 · Adjective longitudinal (not comparable) Running across a set direction of an object.