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round lot

noun Stock Exchange.
  1. the conventional unit or quantity in which commodities or securities are bought and sold.
  2. (in a transaction) a quantity of 100 shares of a stock that is active or 10 shares of a stock that is inactive.
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Compare odd lot.

Origin of round lot

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018