DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   M2 \M2\ n.
      A measure of the money supply broader than M1 but narrower
      than M3, comprising M1 plus net time deposits (other than
      large certificates of deposit).
      [WordNet 1.5]