variable has 3 distinct synonyms spread across 3 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is invariable.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
something that is likely to vary; something that is subject to variation
“the weather is one variable to be considered”
1 of the 7 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for variable.
Synonyms, antonyms and the broader and narrower relations for variable come from Princeton University’s WordNet. Full sources and licences.
a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
liable to or capable of change
“rainfall in the tropics is notoriously variable”