Meaning : An event in which one thing is substituted for another.
Example :
The replacement of lost blood by a transfusion of donor blood.
Synonyms : replacement, substitution, switch, transposition
Meaning : The act of changing the arrangement of a given number of elements.
Meaning : Complete change in character or condition.
Example :
The permutations...taking place in the physical world.
Meaning : Act of changing the lineal order of objects in a group.
Permutation meaning in Bengali (Bangla).