luminosity
n.
1630s, "quality of being luminous," from French luminosité or else a native formation from luminous + -ity. In astronomy, "intrinsic brightness of a heavenly body" (as distinguished from apparent magnitude, which diminishes with distance), attested from 1906.
〔李〕[lumin;-osityn.] n.发光，发亮； 光度，亮度 ←lumin (L lumen,luminis)=light 光
〔蒋〕[lumin光，-osity名词后缀] 光明，光辉