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expansion has 3 distinct synonyms spread across 3 of its 4 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 contraction.
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.
the act of increasing (something) in size or volume or quantity or scope
Synonyms, antonyms and the broader and narrower relations for expansion come from Princeton University’s WordNet. Full sources and licences.
a function expressed as a sum or product of terms
“the expansion of (a+b)^2 is a^2 + 2ab + b^2”
a discussion that provides additional information