the act or an instance of opposing or the state of being placing something opposite or of being so placed
hostility
hostile or contrary action
(treated as sing. or pl)
the body of people opposing something
(often Opposition) the main political party opposing the party in power
in astronomy, an opposite position of the sun and another celestial body in which their longitude differs by 180°
in logic, the relation between two propositions having the same subject and predicate but differing in quantity or quality or both
oppositional adj