1. (

• substitution ,
• permutation ,
• transposition ,
• replacement ,
• switch

) an event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood" ;

2. (

• permutation ,

) the act of changing the arrangement of a given number of elements ;

3. (

• permutation

) complete change in character or condition; "the permutations...taking place in the physical world"- Henry Miller ;

4. (

• permutation ,

) act of changing the lineal order of objects in a group ;