A differing opinion or objection; a viewpoint that opposes or contradicts another opinion.
提案に異論が出たため、議論が長引いた。
Because objections were raised to the proposal, the discussion dragged on.
何か異論があれば、遠慮なく言ってください。
If you have any objections, please feel free to speak up.
彼女はその結論に異論を唱えた。
She voiced an objection to that conclusion.