consequence has 9 distinct synonyms spread across 3 of its 3 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 inconsequence.
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 phenomenon that follows and is caused by some previous phenomenon
“the magnetic effect was greater when the rod was lengthwise”
having important effects or influence
“decisions of great consequence are made by the president himself”
Synonyms, antonyms and the broader and narrower relations for consequence come from Princeton University’s WordNet. Full sources and licences.