the quality or state of giving out or reflecting light
we can change the brightness of the bulb
the comet's brightness had dimmed
the quality of being intelligent and quick-witted
he reminded me of my first son with his brightness and inquisitiveness
the quality of being cheerful or lively
there's so much light and brightness in their faces
the quality in sound of being clear, vibrant, and typically high-pitched
tone alters the brightness of the sound