n. The position of that which confronts, faces, or stands over against something else.n. In astronomy, the situation of two heavenly bodies when diametrically opposed to each other as seen from the earth's surface, or when their longitudes differ by 180°.n. The action of opposing, withstanding, resisting, or checking; antagonism; encounter.n. A placing opposite, as for purposes of comparison, contrast, etc., or the state of being so placed, opposed, or contrasted; contrariety.n. In logic, the disagreement between propositions which have the same subject or the same predicate, but differ in quantity or quality, or in both; also, the relation between two terms which are contrasted in any respect.n. In the fine arts, contrast.n. A body of opposers; specifically, those members of a legislative body who are opposed to the administration for the time being, or the political party opposed to the party in power: frequently used adjectively: as, an opposition scheme; the opposition benches in the British House of Commons.n. In fencing. See the quotation.n. In chess, a position where the king of the player who has not the move is directly in front of that of his opponent with one vacant square between.n. See the adjectives.n. In astrology, the aspect formed between two heavenly bodies 180 degrees (or about that distance) from each other: regarded as inimical and pernicious.