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upgrade has 10 distinct synonyms spread across 3 of its 11 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 downgrade.
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.
software that provides better performance than an earlier version did
a reservation that is improved
“I got an upgrade to first class when coach class was full”
hardware that provides better performance than an earlier version did
the act of improving something (especially machinery) by raising it to a higher grade (as by adding or replacing components)
“the power plant received a new upgrade”
to improve what was old or outdated
“I've upgraded my computer so I can run better software”
get better travel conditions
“I upgraded to First Class when Coach Class was overbooked”
give better travel conditions to
“The airline upgraded me when I arrived late and Coach Class was full”
Synonyms, antonyms and the broader and narrower relations for upgrade come from Princeton University’s WordNet. Full sources and licences.