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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 ?
While losses from a significant participation activity are considered passive activity losses, if passive activity gross income from all of a taxpayer's significant participation activities for the tax year exceeds the taxpayer's passive activity deductions from all such activities for the year, a ratable portion of the net passive income from each significant participation activity is recharacterized as nonpassive income and, as such, is not subject to the net investment income tax.
When applying this recharacterization rule, the gross rental activity income for a tax year includes any passive activity gross income (determined without regard to the recharacterization rules) that is income for the year from the rental or disposition of the property; see Regs.
731(a) gain recognized by nonmaterial participants will be treated as passive activity gross income and netted against their passive activity suspended losses, according to Rev.