Definition 1.
The difference between the closing price of a security on the trading day and the previous day's closing price.
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Definition 2.
This is the difference between a day's last trade and the previous day's last trade.
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Definition 3.
The difference between the close of a security or commodity on one trading day and that of the previous day. For over-the-counter stocks, the bid price is typically used.
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Definition 4.
The difference between today's last trade and the previous day's last trade.
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