"variable" in the noun sense
something that is likely to vary something that is subject to variation
"the weather is one variable to be considered"
2. variable, variable quantity
a quantity that can assume any of a set of values
3. variable star, variable
a star that varies noticeably in brightness
a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
"variable" in the adjective sense
liable to or capable of change
"rainfall in the tropics is notoriously variable"
2. varying, variable
marked by diversity or difference
"the varying angles of roof slope"
"nature is infinitely 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"
Source: WordNet® (An amazing lexical database of English)
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