The relative rate at which the price of a security moves up and down. Volatility is found by calculating the annualized standard deviation of daily change in price. If the price of a stock moves up and down rapidly over short time periods, it has high volatility. If the price almost never changes, it has low volatility.
Related information about volatility:
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/ˈvɒl ə tl, -tɪl or, esp. British, -ˌtaɪl/ Show Spelled [vol-uh-tl, -til or, esp. British, -  tahyl] Show IPA. adjective. 1. evaporating rapidly; passing off readily in the form ...
  
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vol·a·tile (v l -tl, -t l ). adj. 1. Chemistry. a. Evaporating readily at normal   temperatures and pressures. b. That can be readily vaporized. 2. a. Tending to   vary often ...
  
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Definition of volatility: The relative rate at which the price of a security moves up   and down. Volatility is found by calculating the annualized standard deviation of ...