The Collaborative International Dictionary of English v.0.48:
maximisation \maximisation\ n. 1. Maximization. [Chiefly Brit.] [WordNet 1.5]WordNet (r) 3.0 (2006):
maximisation n 1: the act of raising to the highest possible point or condition or position [syn: maximization, maximisation, maximation] [ant: minimisation, minimization]