Meaning of “opponent” in the English Dictionary

"opponent" in British English

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opponentnoun [ C ]

uk /əˈpəʊ.nənt/ us /əˈpoʊ.nənt/

B2 a person who disagrees with something and speaks against it or tries to change it:

a political opponent
Leading opponents of the proposed cuts in defence spending will meet later today.

B2 a person who someone is competing against in a sports event:

In the second game, her opponent hurt her leg and had to retire.

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(Definition of “opponent” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"opponent" in American English

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opponentnoun [ C ]

us /əˈpoʊ·nənt/

opponent noun [ C ] (OPPOSING POSITION)

a person who disagrees with something and speaks against it or tries to change it:

Opponents of the project fear it will attract undesirables.

opponent noun [ C ] (COMPETITOR)

a person you are competing against, esp. in politics or sports:

His chief opponent in the November election will be Jim Crowley.

(Definition of “opponent” from the Cambridge Academic Content Dictionary © Cambridge University Press)