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“adjunction” in Latin

The English word adjunction itself goes back to Latin iungō, through adjunctio.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

adjunction
adjunctio: appositio (act of placing by or after): adjectio.
Thing joined, accessio: additamentum.

Quick answer

What is the Latin word for adjunction?
The usual Latin words for “adjunction” are adiūnctiō, appositiō, adiectiō; also accessiō, additāmentum. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.