volatility

Short definition from Wiktionary

Noun

1. 1
   The state of being volatile.
2. 2
   The state of having a low boiling point and evaporating readily.
3. 3
   The state of not retaining data in the absence of power.
4. 4
   The state of being able to fly.
5. 5
   The state of being unpredictable.
6. 6
   A quantification of the degree of uncertainty about the future price of a commodity, share, or other financial product.