Source : WordNet®

dialog
     n 1: a conversation between two persons [syn: {dialogue}, {duologue}]
     2: the lines spoken by characters in drama or fiction [syn: {dialogue}]
     3: a literary composition in the form of a conversation between
        two people; "he has read Plato's Dialogues in the original
        Greek" [syn: {dialogue}]

Source : Free On-Line Dictionary of Computing

DIALOG
     
        1. A commercial bibliographic database and retrieval service
        from DIALOG Information Services.
     
        2. Interactive mathematics using a {graphics tablet} by
        Illinois Inst Tech, 1966.
     
        ["DIALOG: A Conversational Programming System with a Graphical
        Orientation", S.H. Cameron et al, CACM 10:349-357 (1967).
        Sammet 1969, p.255-258].