Source : Webster's Revised Unabridged Dictionary (1913)

Playbook \Play"book`\, n.
   A book of dramatic compositions; a book of the play. --Swift.

Source : WordNet®

playbook
     n 1: a notebook containing descriptions and diagrams of the plays
          that a team has practiced (especially an American
          football team)
     2: a book containg the scripts of one or more dramatic plays;
        "the 1963 playbook leaves out the whole first scene"
     3: a scheme or set of strategies for conducting a business
        campaign or a political campaign; "they borrowed a page
        from the playbook of the opposition"