LATIN DICTIONARYLexicon Latīnum
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“twilight” in Latin

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

twilight
lux incerta or dubia (poetical): lumen incertum or obscurum. In the cold zones there prevails only a kind of twilight, from the frozen snow, in zonis frigidis maligna est ac pruina tantum albicans lux (Plin., 2, 68, 68): it was already seven o’clock, and there was still only a feeble twilight, jam hora diei prima, et adhuc dubius et quasi languidus dies (Plin., Ep., 6, 20, 6). Morning twilight, diluculum: evening twilight, crepusculum (the proper word): tenebrae (shades of evening).

Quick answer

What is the Latin word for twilight?
The usual Latin words for “twilight” are dubius, obscūrus, dīlūculum; also crepusculum, tenebrae. 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.