resolution has 14 distinct synonyms spread across 7 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 preparation.
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 formal expression by a meeting; agreed to by a vote
the ability of a microscope or telescope to measure the angular separation of images that are close together
the trait of being resolute
“his resoluteness carried him through the battle”
something settled or resolved; the outcome of decision making
“they finally reached a settlement with the union”
analysis into clear-cut components
(computer science) the number of pixels per square inch on a computer-generated display; the greater the resolution, the better the picture
the subsidence of swelling or other signs of inflammation (especially in a lung)
(music) a dissonant chord is followed by a consonant chord
a decision to do something or to behave in a certain manner
“he always wrote down his New Year's resolutions”
Synonyms, antonyms and the broader and narrower relations for resolution come from Princeton University’s WordNet. Full sources and licences.