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Crossword clue: a proportion derived from another proportion by interchanging the means.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

alternate 9 letters web-def

go back and forth; swing back and forth between two states or conditions

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Related clues

go back and forth; swing back and forth between two states or conditions of leaves and branches etc; first on one side and then on the other in two ranks along an axis; not paired