Options Glossary: G

Gamma

A measure of the rate of change in an option's delta for a one-unit change in the price of the underlying stock. See also Delta.

Good-'til-cancelled (GTC) order

A type of limit order that remains in effect until it is either executed (filled) or cancelled, as opposed to a day order, which expires if not executed by the end of the trading day. A GTC option order is an order which if not executed will be automatically cancelled at the option's expiration.

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