Medical Definition of indication
1a: a symptom or particular circumstance that indicates the advisability or necessity of a specific medical treatment or procedure <postpartum hemorrhage is the chief indication for the use of ergot preparations and derivatives—C. H. Thienes>b: something that is indicated as advisable or necessary <in case of collapse the immediate indication is artificial respiration—Journal of the American Medical Association>
2: the degree indicated in a specific instance or at a specific time on a graduated physical instrument (as a thermometer)
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