lon·gi·tu·di·nal
adj 1 : of, relating to, or occurring in the lengthwise dimension <a bone fracture> 2 : extending along or relating to the anteroposterior axis of a body or part <a trypanosome which reproduces by 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 study of heart transplant recipients over a five-year period> lon*gi*tu*di*nal*ly adv
Brit also
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