#1 opposition n. [resistance] the action of opposing something that you disapprove or disagree with; "he encountered a general feeling of resistance from many citizens"; "despite opposition from the newspapers he went ahead". wn
#2 opposition n. [oppositeness] the relation between opposed entities. wn
#3 opposition n. [confrontation] the act of hostile groups opposing each other; "the government was not ready for a confrontation with the unions"; "the invaders encountered stiff opposition". wn
#4 opposition n. [opponent, opposite] a contestant that you are matched against. wn
#5 opposition n. a body of people united in opposing something. wn
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