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| lon·gi·tu·di·nal stud·y (plural lon·gi·tu·di·nal stud·ies) or lon·gi·tu·di·nal sur·vey (plural lon·gi·tu·di·nal sur·veys) |
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research study over time: a study repeated over time, e.g. following the health of 20,000 people over the age of 50 over a period of 20 years
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