luminance
UK[ˈluːmɪnəns]US[ˈluːmɪnəns]
n
the intensity of light emitted from a surface per unit area in a given direction.
n
the quantitative measure of brightness of a light source or an illuminated surface.
Morpheme Breakdown
lumin
ance
lumin
light
ance
noun suffix
Etymology
the word luminance is a modern scientific term formed from the classical latin root 'lumen', meaning 'light'. this root itself descends from the proto-indo-european base leuk-, meaning 'light' or 'brightness', which is the source for many light-related words across indo-european languages. the suffix '-ance' was adopted into english from old french, ultimately from latin '-antia', denoting a state or quality. therefore, luminance literally means 'the state or quality of light', which evolved into its precise technical definition quantifying the intensity of visible light.
Analysis
Structure: lumin (light) + ance (noun suffix)
lumin is derived from latin 'lumen' meaning 'light'. ance is a noun-forming suffix of latin origin via old french, indicating a state, quality, or action.
Examples
the screen's high luminance makes it easily readable in direct sunlight.
engineers measured the luminance of the new led bulb to ensure it met safety standards.
adjusting the luminance and contrast can significantly improve the image quality.