LATIN DICTIONARYLexicon Latīnum
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“ascension” in Latin

The English word ascension itself goes back to Latin scandō, through ascēnsiō.

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

ascension
ascensus, us (in aliquid; also of ascension of the stars): ascensio (less common): conscensio (in aliquid: act of climbing or mounting for the purpose of entering into: escensus is without certain authority in the old writers, for in Liv., 34, 28, and Tac., Ann., 13, 39, 2, ascensu is now read).
Ascension to heaven, abitus or ascensus in caelum.
Ascension day, dies per Christi in caelum abitum sacrata; or dies memoriae Christi in caelum profecti sacra. In the Roman Catholic Church, festum [dies festus] ascensionis Domini.

Quick answer

What is the Latin word for ascension?
The usual Latin words for “ascension” are ascendō, ascēnsiō, cōnscēnsiō; also abitus, fēstus. 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.