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1. An act that requires use of resources or time. In Program Evaluation and Review Technique (PERT), an activity is represented by an arrow on a PERT chart.

2. In investing, the amount of a security's relative trading volume; that is, the amount of money flowing into and out of a security in trading. A high amount of activity means that many shares of the security are being bought and sold at a high rate, while a low level of activity indicates the opposite.


The amount of relative trading volume in a security.
References in periodicals archive ?
Later, when the ATP of the myocardial fiber is exhausted, the heart enters into pulseless electrical activity and, later, falls into the rhythm of death and of the worst prognosis: asystole.
Contrary to results from earlier studies, patients with either ventricular fibrillation or pulseless electrical activity did not seem to benefit from the vasopressin.
During attempts to arrange for embolectomy, the patient developed pulseless electrical activity and could not be resuscitated.