LATIN DICTIONARYLexicon Latīnum
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“perpetual” in Latin

The English word perpetual itself goes back to Latin petō, through perpetuālis.

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

perpetual
Lasting, perpetuus (uninterrupted): perennis (of constant duration): continens, continuus (following immediately one after another): sempiternus: aeternus [SYN. in ETERNAL]. (The words are found in this connection and order.) perpetuus et aeternus; perpetuus et sempiternus. Perpetual snow, nives quas ne aestas quidem solvit: perpetual rain, assidui imbres; imbrium continuatio: perpetual drought, siccitates (see Herzog, Caes., B.G., 4, 10): perpetual fever, febris continens, or continua, or assidua: perpetual toil, labor assiduus or continuus: perpetual diligence, assiduitas: perpetual sleep, somnus continens.
Assiduous, etc., assiduus: sedulus, etc. SYN. in ASSIDUOUS.

Quick answer

What is the Latin word for perpetual?
The usual Latin words for “perpetual” are perpetuus, perennis, contineō; also continuus, sempiternus, aeternus. 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.