LATIN DICTIONARYLexicon Latīnum
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“alienation” in Latin

The English word alienation itself goes back to Latin aliēnus, through alienatio.

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

alienation
act of parting with property: alienatio, abalienatio (the proper word): venditio (sale). Alienation of part of a property, deminutio de aliqua re.
Estrangement, alienatio: from anybody, ab aliquo (also, ab aliquo ad aliquem). (The words are found in this connection and order), alienatio disjunctioque: disjunctio animorum (with reference to both parties): defectio (desertion: of alienation from a public character; from a man’s party): dissidium (dissension, and consequent keeping aloof).

Quick answer

What is the Latin word for alienation?
The usual Latin words for “alienation” are aliēnātiō, abaliēnātiō, vēnditiō; also dēfectiō, discidium. 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.