associahedron
(aeronautics, motor racing) A parachute deployed behind an aircraft, space shuttle, or motor vehicle as a braking device.
(mathematics) A convex polytope in which each vertex corresponds to a way of correctly inserting opening and closing parentheses in a word of n letters and the edges correspond to a single application of the associativity rule.
(Internet slang) Uncool in a tryhard, out-of-touch way, especially in the context of lifestyle trends of the 2010s.
plural of NtRTI
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