permutation

名词 permutation:

1. an event in which one thing is substituted for another
   同义词：substitution, transposition, replacement, switch
2. the act of changing the arrangement of a given number of elements
3. complete change in character or condition- Henry Miller
4. act of changing the lineal order of objects in a group

per.mu.ta.tion

n.（名词）
A complete change; a transformation.
彻底的改变；转变
The act of altering a given set of objects in a group.
置换：改变某一组中一群排列好的物体的行为
Mathematics An ordered arrangement of the elements of a set.
【数学】 数列：一组元素的有序排列

【引伸】
per.muta.tional
adj.（形容词）