bright·ness 
(brītnĭs)
(brītnĭs)n.
1. The state or quality of being bright.
2. The effect or sensation by means of which an observer is able to distinguish differences in luminance.
3. The dimension of a color that represents its similarity to one of a series of achromatic colors ranging from very dim (dark) to very bright (dazzling).
- ethnic
- ethnical
- ethnically
- ethnic cleansing
- ethnicity
- ethnic profiling
- ethno-
- ethnoastronomical
- ethnoastronomy
- ethnobiological
- ethnobiologist
- ethnobiology
- ethnobotanical
- ethnobotanically
- ethnobotanist
- ethnobotany
- ethnocentric
- ethnocentrically
- ethnocentricity
- ethnocentrism
- ethnogenesis
- ethnographer
- ethnographic
- ethnographical
- ethnographically