appreciate has 7 distinct synonyms spread across 4 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. Its one recorded opposite is depreciate.
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.
recognize with gratitude; be grateful for
be fully aware of; realize fully
“Do you appreciate the full meaning of this letter?”
increase the value of
“The Germans want to appreciate the Deutsche Mark”
Synonyms, antonyms and the broader and narrower relations for appreciate come from Princeton University’s WordNet. Full sources and licences.