Merriam-Webster Collegiate Dictionary - transpose

 I. transitive verb  (~d; transposing)  Etymology: Middle English, from Anglo-French ~r, from Latin transponere (perfect indicative transposui) to change the position of, from trans- + ponere to put, place — more at position  Date: 14th century  1. to change in form or nature ; transform  2. to render into another language, style, or manner of expression ; translate  3. to transfer from one place or period to another ; shift  4. to change the relative place or normal order of ; alter the sequence of ~ letters to change the spelling  5. to write or perform (a musical composition) in a different key  6. to bring (a term) from one side of an algebraic equation to the other with change of sign  Synonyms: see reverse  • transposable adjective  II. noun  Date: 1937 a matrix formed from another matrix by interchanging the rows and columns