LATIN DICTIONARYLexicon Latīnum
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“ground-floor” in Latin

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

ground-floor
contignatio, quae piano pede est (after Vitr. 7, 4, 1) [Vid: FLOOR]: ☞ atrium = hall. The rooms on the ground, conclavia, quae piano pede sunt (Vitr., 7, 4, 1): to live on the ground-floor, piano pede habitare (after the above passage).

Quick answer

What is the Latin word for ground-floor?
The usual Latin words for “ground-floor” are contignātiō, conclāve. 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.