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rationalise has 6 distinct synonyms spread across 5 of its 5 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.
structure and run according to rational or scientific principles in order to achieve desired results
“We rationalized the factory's production and raised profits”
Synonyms, antonyms and the broader and narrower relations for rationalise come from Princeton University’s WordNet. Full sources and licences.
think rationally; employ logic or reason
“When one wonders why one is doing certain things, one should rationalize”
remove irrational quantities from
“This function can be rationalized”
weed out unwanted or unnecessary things
“We had to lose weight, so we cut the sugar from our diet”