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scan has 6 distinct synonyms spread across 3 of its 9 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.
Synonyms, antonyms and the broader and narrower relations for scan come from Princeton University’s WordNet. Full sources and licences.
make a wide, sweeping search of
“The beams scanned the night sky”
move a light beam over; in electronics, to reproduce an image
the act of scanning; systematic examination of a prescribed region
“he made a thorough scan of the beach with his binoculars”