1) Decrease 2) Diminution 3) Minimisation 4) Reduction 5) Step-down 1) Minimisation 
• (n.) The act or process of minimizing.
one of the strategies used in the compositional method that makes variations of a leitmotiv. Minimizing the leitmotiv would mean making it smaller, mainly in terms of its occupation of space. For example, if the leitmotiv is a step forward, applying minimization will convert it into different smaller possibilities of that same step.
Minimization treatments consists of successive alterations of the geometry of the molecule until a minimum is found on the conformational potential surface.
Min`i·mi·za'tion noun The act or process of minimizing. Bentham. 
[n] - the act of reducing something to the least possible amount or degree or position
minimization Related 'few, small, less, little' word units: micro-;mio-; nano-; oligo-, olig-.
A comprehensive program to minimize or eliminate wastes, usually applied to wastes at their point of origin. (See waste minimization.) 
minimisation noun the act of reducing something to the least possible amount or degree or position
the act of reducing something to the least possible amount or degree