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“tautology” in Latin

The English word tautology itself goes back to Latin tautŏlŏgĭa.

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

tautology
ejusdem verbi aut sermonis iteratio: repetitio: iteratio (verborum, rerum, nominum, Quint.): crebra repetitio (Cic.): tautologia (Marcellinus, Cap). To avoid tautology, vitare, fugere, repetitionem ejusdem verbi (after Cic.).

Quick answer

What is the Latin word for tautology?
The usual Latin words for “tautology” are repetītiō, iterātiō, tautŏlŏgĭa; also verbum, rēs, nōmen. 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.