any of the different ways in which a set of things can be ordered 排列(方式);组合(方式);置换 The possible permutations of x, y and z are xyz, xzy, yxz, yzx, zxy and zyx. x、y 和 z 的可能的组合方式为 xyz、xzy、yxz、yzx、zxy 和 zyx。
Word Originlate Middle English (in the sense ‘exchange, barter’): via Old French from Latin permutatio(n-), from the verb permutare ‘change completely’, from per- ‘through, completely’ + mutare ‘to change’.