5. <astronomy> 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 180 deg; signified by the symbol; as, <su:Jupiter/ <su:Sun/, opposition of Jupiter to the sun.
6. <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.
Origin: F, fr. L. Oppositio. See Opposite.
(01 Mar 1998)
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