illuminated 1 Adjective part of to light . Illuminated. 2 m Set of lights or system that is used to light: The lighting of the population is deficient, the electric lighting has replaced the gas. Illumination. 3 (inf.) Adj. A little drunk. Cheated, cheerful. 4 adj. and n. It applies to the individuals of a certain heretical sect that appeared in Spain in the sixteenth century, which maintained that through prayer it came to such a perfect state that one could commit without sinning the most reprehensible actions. m. pl. That sect. V. lighting gas .