minimisation

from WordNet (r) 3.0 (2006)

minimisation
    n 1: the act of reducing something to the least possible amount
         or degree or position [syn: {minimization}, {minimisation}]
         [ant: {maximation}, {maximisation}, {maximization}]

from The Collaborative International Dictionary of English v.0.48

minimisation \minimisation\ n.
   minimization. [Chiefly Brit.]
   [WordNet 1.5]