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index has 7 distinct synonyms spread across 3 of its 8 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
a numerical scale used to compare variables with one another or with some reference number
a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
Synonyms, antonyms and the broader and narrower relations for index come from Princeton University’s WordNet. Full sources and licences.
a mathematical notation indicating the number of times a quantity is multiplied by itself
an alphabetical listing of names and topics along with page numbers where they are discussed