Etymology

adjoint

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Today it means: Used in certain contexts, in each case involving a pair of transformations, one of which is, or is analogous to, conjugation (either inner automorphism or complex conjugation). Full definition →

French adjoindre
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The story

  1. French · derived fromadjoindre“to join”
  2. English todayadjoint

From French adjoindre (“to join”), from late 19th C; see also adjoin. Doublet of adjunct. In the case of category theory (which brings together concepts from numerous fields), the term is often confounded with adjunct and the relationship is called an adjunction. The origin of any particular usage may therefore be uncertain.

Etymology from Wiktionary, CC BY-SA 4.0.