Definitions
1.verbTo reverse or change the order of (two or more things); to swap or interchange.
2.verbTo rewrite or perform (a piece) in another key.
3.verbTo move (a term) from one side of an algebraic equation to the other, reversing the sign of the term.
4.verbTo rearrange elements in a matrix, by interchanging their respective row and column positional indicators.
5.verb(chiefly of the European Union) To give force to a directive by passing appropriate implementation measures.