variable

Adjective

• (used of a device) designed so that a property (as e.g. light) can be varied
  • a variable capacitor
    
  • variable filters in front of the mercury xenon lights
    

• marked by diversity or difference
  • the varying angles of roof slope
    
  • nature is infinitely variable
    

• liable to or capable of change
  • rainfall in the tropics is notoriously variable
    
  • variable winds
    
  • variable expenses
    

Noun

• a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity

• a star that varies noticeably in brightness

• a quantity that can assume any of a set of values

• something that is likely to vary; something that is subject to variation
  • the weather is one variable to be considered
    

Related words

• Synonyms: 
  varying , variable star , variable quantity