Volatility
How much something's price swings. Not the same as risk, but related.
Where it is explained in full
Options from the beginning: calls, puts, and the Greeks in plain words. What a contract actually is, what the numbers on the screen mean, and why an option's value before expiration is not the same as its payoff at expiration.
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Words beside it
- Implied volatility
The volatility figure that makes an options pricing model match the market price. The market's expectation of future movement.
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