Colour  (us color) —n. 1 sensation produced on the eye by rays of light when resolved as by a prism into different wavelengths. 2 one, or any mixture, of the constituents into which light can be separated as in a spectrum or rainbow, sometimes including (loosely) black and white. 3 colouring substance, esp. Paint. 4 use of all colours in photography etc. 5 a pigmentation of the skin, esp. When dark. B this as ground for discrimination. 6 ruddiness of complexion. 7 (in pl.) Appearance or aspect (saw them in their true colours). 8 (in pl.) A coloured ribbon or uniform etc. Worn to signify membership of a school, club, team, etc. B flag of a regiment or ship. 9 quality, mood, or variety in music, literature, etc. 10 show of reason; pretext (lend colour to; under colour of). —v. 1 apply colour to, esp. By painting, dyeing, etc. 2 influence. 3 misrepresent, exaggerate. 4 take on colour; blush.  show one's true colours reveal one's true character or intentions. [latin color]