/ ænˈtægənɪst; NAmE / noun
( formal ) a person who strongly opposes sb/sth
SYN opponent
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WORD ORIGIN
late 16th cent.: from French antagoniste or late Latin antagonista , from Greek antagōnistēs , from antagōnizesthai struggle against, from ant- against + agōnizesthai struggle (from agōn contest).