Ascension

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Middle English (referring to the ascent of Christ): via Old French from Latin ascensio(n- ), from the verb ascendere (see ascend).

wiktionary

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From Middle English ascencioun, from Old French ascension, from Latin ascēnsiō, ascēnsiōnem(“ascent”).

etymonline

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ascension (n.)

c. 1300, "ascent of Christ from earth into Heaven in the presence of his disciples on the 40th day after the Resurrection," from Latin ascensionem (nominative ascensio) "a rising," noun of action from past-participle stem of ascendere "to mount, ascend, go up" (see ascend). It is commemorated in the Church as Holy Thursday. Astronomical sense is recorded late 14c.; meaning "action of ascending" is from 1590s. Related: Ascensional.