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Definition of Observational study.

Observational study. Definition from Medicine Dictionaries & Glossaries
Glossary of Terms
An epidemiologic study that does not involve any intervention, experimental or otherwise. Such a study may be one in which nature is allowed to take its course, with changes in one characteristic being studied in relation to changes in other characteristics. Analytical epidemiologic methods, such as case-control and cohort study designs, are properly called observational epidemiology because the investigator is observing without intervention other than to record, classify, count, and statistically analyze results.
National Institutes of Health
NCI Dictionary of Cancer Terms
A type of study in which individuals are observed or certain outcomes are measured. No attempt is made to affect the outcome (for example, no treatment is given).
A Service of the National Cancer Institute.
Glossary of Epidemiology Terms
Epidemiological study in situations where nature is allowed to take its course. Changes or differences in one characteristic are studied in relation to changes or differences in others, without the intervention of the investigator.
Aids Glossary
a study in which no experimental drug is administered, but the patient's symptoms, laboratory values and response to treatment are observed during the course of normal medical management.
Observational study. Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
In fields such as epidemiology, social sciences, psychology  and statistics, an observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher. One common observational study is about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the investigator. This is in contrast with experiments, such as randomized controlled trials, where each subject is randomly assigned to a treated group or a control group.

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