The Collaborative International Dictionary of English v.0.48:
overutilisation \overutilisation\ n. Same as overutilization. [Chiefly Brit.] Syn: overexploitation, overuse, overutilization. [WordNet 1.5]WordNet (r) 3.0 (2006):
overutilisation n 1: exploitation to the point of diminishing returns [syn: overexploitation, overuse, overutilization, overutilisation]