What does "chroma" mean?

The colorfulness relative to the brightness of a similarly illuminated area

Chroma

Common synonyms include: brightness, chroma vector, color information, color intensity, color purity, colorfulness.

/ˈkɹoʊmə/ noun

noun ·Rare ·Advanced level

Noun

1
The colorfulness relative to the brightness of a similarly illuminated area countable, uncountable
2
chromatic purity: freedom from dilution with white and hence vivid in hue wordnet
3
The aspect of a colour's hue that depends on the amount of white or black in it; saturation countable, uncountable
4
Short for chromatic semitone abbreviation, alt-of, countable, uncountable

From Ancient Greek χρῶμα (khrôma, “color”).