LATIN DICTIONARYLexicon Latīnum
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“addition” in Latin

The English word addition itself goes back to Latin addō, through additiōnem.

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

addition
adjunctio: appositio (the placing to, or adding; e.g., of examples, exemplorum): adjectio: accessio (something added: in rhetoric, an addition that completes a definition): additamentum (thing added). Phrase. To improve a work by additions and corrections, librum crebris locis inculcare et reficere (Cic.): to set anything forth with lying additions, mendaciunculis aspergere aliquid. To make many important additions to his edict, multas res novas in edictum addere (Liv., 1, 30).
Arithmetical addition, calculorum subductio: computatio (calculation generally). By addition and subtraction, addendo deducendoque.

Quick answer

What is the Latin word for addition?
The usual Latin words for “addition” are adiūnctiō, appositiō, adiectiō; also accessiō, additāmentum, exemplum. 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.