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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.
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The amount of relative trading volume in a security.
Wall Street Words: An A to Z Guide to Investment Terms for Today's Investor by David L. Scott. Copyright © 2003 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. All rights reserved.
References in periodicals archive ?
Using incidence of arrhythmogenic triggered activity and myocyte mechanics as end points, the dose-response curve of the rapid effects of BPS had a nonmonotonic shape, similar to that described for BPA (Liang et al.
We observed that in both male and female rat cardiac myocytes, ER[beta] signaling had stimulatory effects on [Ca.sup.2+] handling and development of triggered activity, but ER[alpha] signaling was inhibitory.
Arrows indicate spontaneous [Ca.sup.2+] after-transients (i.e., triggered activity) following pacing.