Relating to or involving the cotangent function, or tangent in a complementary or secondary way.
From 'cotangent' with the suffix '-ial' meaning 'relating to'. It's a mathematical adjective describing things connected to the cotangent function.
This is a rare geometric term, but it shows how mathematical language builds—once you have 'cotangent', you can create 'cotangential', 'cotangentially', and so on, expanding the mathematical vocabulary systematically.
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