IPA: /ˈrɛdnəs/
KK: /ˈrɛd.nəs/
The state or quality of being red in color or having a red appearance.
The redness of the sunset was breathtaking.
Redness → It is formed from "red" (from Old English "read", meaning of the color red) and "-ness" (a suffix meaning the state or quality of). The word "redness" refers to the state or quality of being red.
Think of the color 'red' and remember that 'redness' means the quality of being red.