DEFINITION of 'Gamma'
The rate of change for delta with respect to the underlying asset's price. Gamma is an important measure of the convexity of a derivative's value, in relation to the underlying. In a deltahedge strategy, gamma is sought to be reduced in order to maintain a hedge over a wider price range. A consequence of reducing gamma, however, is that alpha too will be reduced.
INVESTOPEDIA EXPLAINS 'Gamma'
Mathematically, gamma is the first derivative of delta and is used when trying to gauge the price movement of an option, relative to the amount it is in or out of the money. When the option being measured is deep in or out of the money, gamma is small. When the option is near or at the money, gamma is at its largest. Gamma calculations are most accurate for small changes in the price of the underlying asset.

Zomma
An options greek used to measure the change in gamma in relation ... 
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Greeks
Dimensions of risk involved in taking a position in an option ...

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