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volatility
volcanic
volcano
vole

volatile 
1  adj A situation that is volatile is likely to change suddenly and unexpectedly.  (=unstable) 
The international oil markets have been highly volatile since the early 1970s...  
♦  volatility  n-uncount  (=instability) 
He is keen to see a general reduction in arms sales given the volatility of the region.  
2  adj If someone is volatile, their mood often changes quickly. 
He has a volatile temper.  
3  adj A volatile liquid or substance is one that will quickly change into a gas.  (TECHNICAL) 
It's thought that the blast occurred when volatile chemicals exploded.  



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