in·di·ca·tion / ˌindiˈkāshən/ • n. a sign or piece of information that indicates something: the visit was an indication of the improvement in relations between the countries. ∎  a reading given by a gauge or meter. ∎  a symptom that suggests certain medical treatment is necessary: heavy bleeding is a common indication for hysterectomy.

indication (indi-kay-shŏn) n. (in medicine)
1. a strong reason for believing that a particular course of action is desirable.

2. any of the conditions for which a particular drug treatment may be prescribed, as defined by its licence. Compare contraindication.