(modifier) (of a print or photographic process) using the principle in which four colours (magenta, cyan, yellow, and black) are used in combination to produce almost any other colour
Math vs. MathsBoth math and maths are short for the word mathematics. Math is the preferred term in the United States and Canada. Maths is the preferred term in England, Australia, and most other English-speaking places.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for four-colour
Occasionally three and four-colour machines are used, but the one-colour type is probably the most common.The Jute Industry: From Seed to Finished Cloth|T. Woodhouse and P. Kilgour