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the act of opposing or the state of being opposed

hostility, unfriendliness, or antagonism

a person or group antagonistic or opposite in aims to another

a position facing or opposite another

the act of placing something facing or opposite something else

something that acts as an obstacle to some course or progress

astronomy

1. the position of an outer planet or the moon when it is in line or nearly in line with the earth as seen from the sun and is approximately at its nearest to the earth

2. the position of two celestial bodies when they appear to be diametrically opposite each other on the celestial sphere Compare conjunction

astrology an exact aspect of 180° between two planets, etc, an orb of 8° being allowed See conjunction square trine

logic

1. the relation between propositions having the same subject and predicate but differing in quality, quantity, or both, as with all men are wicked; no men are wicked; some men are not wicked

2. a diagram representing these relations with the contradictory propositions at diagonally opposite corners

chess a relative position of the kings in the endgame such that the player who has the move is at a disadvantage

A characteristic movement of the primate thumb, in which the pad of the thumb can be placed in contact with the pads of the fingers of the same hand.

The position of two celestial bodies when their celestial 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. Planets in this position rise as the Sun sets and are visible all night long, reaching their highest point in the sky at midnight; the Moon in this position is full.

Compare conjunction See more at elongation