opposition

The act of hostile groups opposing each other.

“the invaders encountered stiff opposition”

An armed adversary (especially a member of an opposing military force).

The action of opposing something that you disapprove or disagree with.

“despite opposition from the newspapers he went ahead”

A contestant that you are matched against.

The relation between opposed entities.

A body of people united in opposing something.

A direction opposite to another.

The major political party opposed to the party in office and prepared to replace it if elected.

“Her Majesty's loyal opposition”