What does "opposition" mean?

Additional senses

1. 2.Repugnance; contrariety of sentiment, interest, or purpose; antipathy. Shak.
2. 3.That which opposes; an obstacle; specifically, the aggregate of persons or things opposing; hence, in politics and parliamentary practice, the party opposed to the party in power.
3. 4.(Astron.) The situation of a heavenly body with respect to another when in the part of the heavens directly opposite to it; especially, the position of a planet or satellite when its longitude differs from that of the sun 180º; -- signified by the symbol as, .
4. 5.(Logic) The relation between two propositions when, having the same subject and predicate, they differ in quantity, or in quality, or in both; or between two propositions which have the same matter but a different form.