From Wiktionary, the free dictionary
From opposition + -ist .
oppositionist (plural oppositionists )
A person who opposes ; especially a member of an official opposition
1944 , Morris Allison Bealle, Washington Squirrel Cage , page 9:They felt that the fellow was a quockerwodger rather than a politician, an againster rather than a true American, an oppositionist in fundamental things rather than a sincere patriot.
2015 , Rosemary Sullivan, Stalin's Daughter , →ISBN , page 137 :I see your marriage as a move to establish links with the oppositionist Russian intelligentsia.
a person who opposes; especially a member of an official opposition
Armenian: ընդդիմադիր (hy) ( ənddimadir )
Azerbaijani: müxalifətçi
Belarusian: апазіцыяне́р m ( apazicyjanjér ) , апазіцыяне́рка f ( apazicyjanjérka )
Bulgarian: опозиционе́р m ( opozicionér ) , опозиционе́рка f ( opozicionérka )
Chinese:
Mandarin: 反對派 分子 / 反对派 分子 ( fǎnduìpài fènzi ) , 反對派 / 反对派 (zh) ( fǎnduìpài )
Estonian: opositsionäär
Finnish: vastustaja (fi)
French: opposant (fr) m , opposante (fr) f
Georgian: ოპოზიციონერი ( oṗozicioneri )
German: Oppositioneller (de) m , Oppositionelle (de) f
Hungarian: ellenzéki (hu)
Japanese: 反対者 ( はんたいしゃ, hantaisha )
Korean: 반대론자 (ko) ( bandaeronja )
Polish: opozycjonista m , opozycjonistka (pl) f
Russian: оппозиционе́р (ru) m ( oppozicionér ) , оппозиционе́рка (ru) f ( oppozicionérka )
Spanish: opositor (es) m , opositora f
Ukrainian: опозиціоне́р m ( opozycionér ) , опозиціоне́рка f ( opozycionérka )
Uzbek: oppozitsioner
Vietnamese: người phản đối