n.1 resistance, antagonism.
2 the state of being hostile or in conflict or disagreement.
3 contrast or antithesis.
4 a a group or party of opponents or competitors. b (the Opposition) Brit. the principal parliamentary party opposed to that in office.
5 the act of opposing or placing opposite.
6 a diametrically opposite position. b Astrol. & Astron. the position of two heavenly bodies when their longitude differs by 180°, as seen from the earth.
Derivatives:
oppositional adj.
Etymology: ME f. OF f. L oppositio (as OB-, POSITION)