spread

1. The difference between the current bid and the current ask (in over-the-counter trading) or offered (in exchangetrading) of a given security; also called bid/ask spread.

2. The purchase of one option and the simultaneous sale of a related option, such as two options of the sameclass but different strike prices and/or expiration dates. also called spread option.

3. More generally, the difference between any two prices.