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English to English noun 1. an event in which one thing is substituted for another  the replacement of lost blood by a transfusion of donor blood source: wordnet30
2. the act of changing the arrangement of a given number of elements source: wordnet30
3. complete change in character or condition the permutations...taking place in the physical world source: wordnet30
4. act of changing the lineal order of objects in a group source: wordnet30
5. The act of permuting; exchange of the thing for another; mutual transference; interchange. source: webster1913
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