语言石化现象指在第二语言和外语教学中，一个时不时会出现的过程，在这个过程中，不正确的语言特征成为了一个人说或写一门语言的方式的一个不变的部分。

Fossilization is defined as (in second and foreign language teaching)a process occurring from time to time in which incorrect linguistic features become a permanent part of the way a person speaks or writes a language.