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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 ?
For purpose of this study, the outcome of the shock was defined according to the following criteria: return of a perfusing rhythm (PR), if defibrillation restored an organised rhythm with heart rate [greater than or equal to] 40 /min commencing within the one-minute post-shock period and persisting for a minimum of 30 seconds; or failure of return of a perfusing rhythm (NR), if ventricular fibrillation, ventricular tachycardia (heart rate > 150 /min), asystole or pulseless electrical activity, with pauses > five seconds, occurred.
In addition to the changes demonstrated in this electrocardiogram, pulmonary embolism may cause atrial flutter or fibrillation, right ventricular premature beats, ventricular fibrillation, right bundle branch block (complete or incomplete) or less marked right ventricular conduction delay, right ventricular hypertrophy, ST-segment elevation, a long QT interval, and pulseless electrical activity (1-7) (Table).
Battalion Chief Helen Ortega of Collier County EMS in Naples, FL, which recently purchased five units, says of the AutoPulse, "We have even had successful resuscitations from asystole (flatline) and pulseless electrical activity (PEA).