: a configuration (see configuration 1b) in which one celestial (see 1celestial 2) body is opposite another (such as the sun) in the sky or in which the elongation (see elongation 1) is near or equal to 180 degrees
: the relation between two propositions having the same subject and predicate but differing in quantity or quality or both
: an act of setting opposite or over against : the condition of being so set
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