com.mu.ta.tive
adj.（形容词）Relating to, involving, or characterized by substitution, interchange, or exchange.交换的；代替的：有关、包含或特征是替代、交替、交换的Independent of order. Used of a logical or mathematical operation that combines objects or sets of objects two at a time. Ifa × b = b × a , the operation indicated by × is commutative. 交换的：次序的独立。用于一次联接两个或两组对象的逻辑或数学操作。如果a × b = b × a ，由×表示的操作是可交换的
【引伸】
commu.tativ.ity
