LATIN DICTIONARYLexicon Latīnum
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“lighten” in Latin

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

lighten v.
INTR., fulgurare; fulgere (PROP. and figuratively); micare, splendere (figuratively, to sparkle, glitter). The swords lightened, micantes fulsere gladii: he seemed not to speak, but to thunder and lighten, non loqui et orare sed fulgurare ac tonare videbatur: the eyes lighten, oculi scintillant.
lighten v.
TRANS.,
To give light [Vid. LIGHT, v.] .
To make less heavy, levare alicui aliquid or aliquem re: figuratively, to lighten grief, etc.; Vid: ALLEVIATE.

Quick answer

What is the Latin word for lighten?
The usual Latin words for “lighten” are fulgurō, fulgeō, micō; also splendeō. 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.