1. To act against or provide resistance to; to combat: The same two teams had opposed each other in previous playoffs.
2. To stand in the way of; to hinder; to obstruct: The change is opposed by many of the town's business leaders.
3. To set as an obstacle or an adversary: Sharon met the candidate who will be opposing her in the next election.
4. To be hostile or adverse to, as in opinion: Henry strongly opposed the resolution in the proposal to increase local taxes.
5. To determine as an impediment or a hindrance: The group that opposes the mayor is trying to find a candidate who might be able to successfully oppose her in the upcoming election.