In mathematics, a related operator or matrix created through a specific transformation; in grammar, an optional modifying element.
From ad- + joint (from Latin jungere 'to join'). The mathematical sense emerged in 19th-century mathematics from French usage.
Adjoint matrices are crucial in quantum mechanics and linear algebra, yet the word remains obscure outside mathematics—it's fascinating how technical jargon can hide in plain sight using familiar roots like 'joint.'
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