a way, especially one of several possible variations, in which a set or number of things can be ordered or arranged 变化组合 his thoughts raced ahead to fifty different permutations of what he must do. 就必须要做的事他很快想出了50种不同的变化组合。 ■[mass noun](Mathematics)the action of changing the arrangement, especially the linear order, of a set of items (数)排列;置换 ■(Brit.)a selection of a specified number of matches in a football pool (英)(足球普尔中特定比赛场次的)挑选
派生 permutational adjective 语源
late Middle English (in the sense 'exchange, barter'): via Old French from Latin permutatio(n-), from the verb permutare 'change completely' (see permute)