opposition

The act of opposing or resisting.

The condition of being in conflict; antagonism.

Placement opposite to or in contrast with another.

Something that serves as an obstacle.

A political party or an organized group opposed to the group, party, or government in power.

The position of two celestial bodies when their longitude differs by 180°, especially a configuration in which Earth lies on a straight line between the sun and a superior planet or the moon.

The position of the superior planet or the moon in this configuration.

The relation existing between two propositions having an identical subject and predicate but differing in quantity, quality, or both.