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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 
 
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