Noun

• S: (n) variable (something that is likely to vary; something that is subject to variation) "the weather is one variable to be considered"
• S: (n) variable, variable quantity (a quantity that can assume any of a set of values)
• S: (n) variable star, variable (a star that varies noticeably in brightness)
• S: (n) variable (a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity)

Adjective

• S: (adj) variable (liable to or capable of change) "rainfall in the tropics is notoriously variable"; "variable winds"; "variable expenses"
• S: (adj) varying, variable (marked by diversity or difference) "the varying angles of roof slope"; "nature is infinitely variable"
• S: (adj) variable ((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"