LATIN DICTIONARYLexicon Latīnum
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“expanse” in Latin

The English word expanse itself goes back to Latin pandō, through expansum.

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

expanse
spatium: the expanse of heaven, spatium caeli or spatium only (both Lucr.); cava caeli (Ennius): the boundless expanse of the heavens, *caeli spatium infinitum or longe lateque patens.

Quick answer

What is the Latin word for expanse?
The usual Latin words for “expanse” are spatium, Ennius. 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.