Black  —adj. 1 reflecting no light, colourless from lack of light (like coal or soot); completely dark. 2 (black) of the human group with dark-coloured skin, esp. African. 3 (of the sky etc.) Heavily overcast. 4 angry; gloomy (black look, mood). 5 implying disgrace etc. (in his black books). 6 wicked, sinister, deadly. 7 portending trouble (things look black). 8 comic but sinister (black comedy). 9 (of tea or coffee) without milk. 10 (of industrial labour or its products) boycotted, esp. By a trade union, in a strike etc. —n. 1 black colour or pigment. 2 black clothes or material (dressed in black). 3 a (in a game) black piece, ball, etc. B player of this. 4 credit side of an account (in the black). 5 (black) member of a dark-skinned race, esp. An african. —v. 1 make black (blacked his boots). 2 declare (goods etc.) ‘black’.  black out 1 effect a blackout on. 2 undergo a blackout. [old english]