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

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].