The University of Colorado website has, in addition to a definition of dialogic listening, a great glossary of listening and communication terms and defintion. It defines dialogic listening as:
Dialogic listening is similar to active listening, although it emphasizes conversation as a shared activity and stresses an open-ended, playful attitude toward the conversation. In addition, the parties focus on what is happening between them (rather than each party focusing on what is going on within the mind of the other), and it focuses on the present more than on the past or the future.