LATIN DICTIONARYLexicon Latīnum
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“summit” in Latin

The English word summit itself goes back to Latin summus, through summum.

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

summit
PROP., Top of a mountain, etc., cacumen: culmen (cacumen = that which runs up to a point; hence of the summit of a pyramid, of a tree, etc.; culmen = “the highest part;” both also of the top of a mountain): ☞ fastigium (PROP., the gable of a roof represents the summit, as that which is most striking or conspicuous, but never in prose for the summit of a mountain): vertex (crown of the head; hence, top, summit; e.g., of a mountain): also frequently by circumlocution with summus; e.g., the summit of a mountain, summum jugum montis; mons summus; (with historians) summum montis or collis.
Figuratively, Height, fastigium; or, mostly, by circumlocution with summus, supremus; e.g., the summit of glory, gloria summa. To raise one’s self to the highest summit of human greatness or power, in summum fastigium emergere et attolli: to stand at the summit, stare in fastigio. Vid: also, HEIGHT.

Quick answer

What is the Latin word for summit?
The usual Latin words for “summit” are cacūmen, culmen, vertex; also superus, fastīgium, collum. 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.