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Definition of Option

From Econterms, for About.com

Definition: Definition of Option: An option is a contract that gives the holder the right, but not the duty, to make a specified transaction for a specified time.

The most common option contracts give the holder the right buy a specific number of shares of the underlying security (equity or index) at a fixed price (called the exercise price or strike price) for a given period of time. Other option contracts allow the holder to sell.

This is its most common practical business meaning, and the use in theoretical economics is analogous -- e.g. that owning a plant gives a firm the option to manufacture in it at any time or to sell it at any time. (Econterms)

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