dissenter
US /dɪˈsen.t̬ɚ/
UK /dɪˈsen.t̬ɚ/

1.
disidente, opositor
a person who dissents, as from an established church, political party, or majority opinion.
:
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The lone dissenter in the group voiced his objections to the proposal.
El único disidente del grupo expresó sus objeciones a la propuesta.
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Historically, dissenters often faced persecution for their beliefs.
Históricamente, los disidentes a menudo enfrentaron persecución por sus creencias.