واژه Permutation در ریاضیات به معنای جایگشت، رجند، فراگردی به کار می رود.
معانی دیگر واژه Permutation عبارتند از: دگرگونی کامل، تغییر اساسی.
نمونه ای از کاربرد این واژه در یک متن ریاضی به صورت زیر است:
Twenty-five students were asked to do four problems related to permutation and combination. The research results showed that the students still did a mistake in understanding the problems related to permutation and combination, the students still made a mistake in planning problem solving related to permutation and combination, and the students still had a mistake in rechecking the problems given. Besides, there were some students who did the combination problem by using the permutation problem.