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“excavation” in Latin

The English word excavation itself goes back to Latin cavus, through excavātiō.

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

excavation
Act of hollowing, excavatio (Sen., lapidis).
An hollow formed, cavatio (Varr., majorem cavationem, quam pocula habebant): *locus effossus (hollow made by digging out earth): cavum (any open or empty space in a body).

Quick answer

What is the Latin word for excavation?
The usual Latin words for “excavation” are excăvātĭo, căvātĭo, cavus. 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.