[mass noun]the occurrence of something in several different forms, in particular 多形现象,尤指 ■(Biology)the occurrence of different forms among the members of a population or colony, or in the life cycle of an individual organism (生)多形性 ■(Genetics)the presence of genetic variation within a population, upon which natural selection can operate (遗传)(基因)多态性 ■(Computing)a feature of a programming language that allows routines to use variables of different types at different times (计算机)多变量性