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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 ?
Target compounds have properties ranging from highly selective separations agents, porous solids for gas storage, compounds with second order non-linear optical activity, and the formation of highly ordered proton conducting solids.
developed an improved piezoelectric polymer based on helical chiral polymers with optical activity and weight-average molecular weights from 50,000 to 1,000,000.
The main optical property where we will focus our attention is the optical activity displayed by some photonic metamaterials.
New York) was one of the few adepts when vibrational optical activity was an esoteric field before the turn of the century.