LATIN DICTIONARYLexicon Latīnum
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“completion” in Latin

The English word completion itself goes back to Latin pleō, through completio.

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

completion
the state of perfection: absolutio, perfectio; (the words are found in this connexion and order.) absolutio perfectioque.
A completing: confectio: consummatio (consummation, post-Augustan): finis, exitus (end). Vid :, also, the examples under COMPLETE.

Quick answer

What is the Latin word for completion?
The usual Latin words for “completion” are absolūtiō, perfectiō, cōnfectiō; also cōnsummātiō, fīnis, exeō. 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.