From luminate + -ion, or a Latin *lūminātiō, *lūminātiōnem, from lūminār, lūmināre (from lūminō, from lūmen (probably from lūx + -men), from Proto-Indo-European *lewk-s-men ("light") (from Proto-Italic *louks, from Proto-Indo-European *lewk- ("bright; light#Adjective") + *-mn̥)) + Latin -tiō, -tiōnem (from Proto-Italic *-tiō, from Proto-Indo-European *-tis ("suffix forming nouns from verbs")), equivalent to [[luminate + -ion.
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