limitation has 2 distinct synonyms spread across 3 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.
a principle that limits the extent of something
“I am willing to accept certain restrictions on my movements”
the quality of being limited or restricted
“it is a good plan but it has serious limitations”
the greatest amount of something that is possible or allowed
“there are limits on the amount you can bet”
(law) a time period after which suits cannot be brought
“statute of limitations”
Synonyms, antonyms and the broader and narrower relations for limitation come from Princeton University’s WordNet. Full sources and licences.