(n) :
		
		any of a range of 
colours having the longest wavelengths, 670
nm, of the visible spectrum; a primary additive colour for transmitted light: the colour obtained by subtracting green and blue from white light using magenta and yellow filters; a 
revolutionary socialist or (most commonly) a 
Communist; (usually capitalized) a 
Bolshevik, a supporter of the Bolsheviks in the Russian Civil War