LATIN DICTIONARYLexicon Latīnum
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“intentional” in Latin

The English word intentional itself goes back to Latin intendō, through intentiōnālis.

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

intentional
cogitatus (premeditated, facinus, parricidium, Suet.), or, by circumlocution, quod consulto et cogitatum fit. An intentional injury, injuria, quae consulto et cogitata fit. An intentional crime, etc., crimen voluntatis (opposed to crimen necessitatis, Cic., Lig., 2, 5).

Quick answer

What is the Latin word for intentional?
The usual Latin words for “intentional” are cōgitō, facinus, parricīdium; also iniūria. 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.