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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 ?
Physiotherapists delivering the experimental intervention received 2 days of training, which focused on the specific skills necessary to provide behavioural graded activity.
The results of our study demonstrate that behavioural graded activity resulted in better adherence to home exercises and activities compared with usual care, both in the short- and long-term.
Graded activity and exercise should start slowly and gradually should increase both the level of activity and the duration.