English to English
1. an event in which one thing is substituted for another
the replacement of lost blood by a transfusion of donor blood
2. the act of changing the arrangement of a given number of elements
3. complete change in character or condition
the permutations...taking place in the physical world
4. act of changing the lineal order of objects in a group
5. The act of permuting; exchange of the thing for another; mutual transference; interchange.