a faction or group that opposes a policy or opinion; the opposition side in a dispute or political context.
政府の新法に対して反対派が街頭で抗議した。
The opposition faction protested on the streets against the government's new law.
社内では導入に賛成する人が多いが、反対派も根強い。
Many people in the company are in favor of the introduction, but the opposition remains strong.
次の選挙で反対派が勢力を伸ばす可能性がある。
The opposition may gain influence in the next election.