ˌ ̷ ̷ ̷ ̷ˈnäsəd.ē, -ətē, -i noun
( -es )
Etymology: from luminous, after such pairs as English curious : curiosity
1.
a. : the quality or state of being luminous
the rare few … who give to accurate reporting the luminosity of poetry — D.C.Peattie
b. : something luminous
mind is a constant luminosity — John Dewey
2.
a. : the relative quantity of light
b. : brightness 2a
3. : the quantity of radiation emitted by a star or other celestial source usually expressed in terms of the sun's intensity or in centimeter-gram-second units
4. : the luminous efficiency of radiant energy : the ratio of light to heat in radiant energy — used in psychophysics