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opposer

/ˈɒpəzər/ · op·poser
noun
  1. A person or entity that opposes or resists something. The opposer in the debate challenged every point made by the speaker.
  2. An adversary or rival in a contest or conflict. In the chess match, the opposer proved to be a formidable opponent.
Did you know? The noun "opposer" is often used in legal contexts to refer to a party who files an objection or opposition to a motion or petition.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Aug 11, 2026