In geometry and mathematics, relating to or denoting a configuration or property that is opposite to or negates a complementary relationship.
From 'anticomplement' plus '-ary' forming an adjective. This is highly technical terminology used in advanced mathematics.
Anticomplementary triangles and anticomplementary angles are real mathematical concepts, but they're so specialized that most people never encounter them—they exist in the upper reaches of geometry where only experts venture.
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