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“annex” in Latin

The English word annex itself goes back to Latin nectō, through annexus.

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

annex
annectera, adjungere aliquid ad aliquid or alicui rei: addere, adjicere, agglutinare: subjicera aliquid alicui rei: copulare aliquid cum aliqua re. Vid: ADD.
annex s.
accessus: accessio. Vid: ADDITION.

Quick answer

What is the Latin word for annex?
The usual Latin words for “annex” are addō, agglūtinō, accēdō; also accessiō. 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.