[dahy-uh-lawg, -log]
conversation between two or more persons.
the conversation between characters in a novel, drama, etc.
an exchange of ideas or opinions on a particular issue, especially a political or religious issue, with a view to reaching an amicable agreement or settlement.
a literary work in the form of a conversation: a dialogue of Plato.
verb (used without object), dialogued, dialoguing.
to carry on a dialogue; converse.
to discuss areas of disagreement frankly in order to resolve them.
verb (used with object), dialogued, dialoguing.
to put into the form of a dialogue.
Also, dialog.

1175–1225; Middle English < Old French dïalogue, Latin dialogus < Greek diálogos. See dia-, -logue

dialoguer, noun
self-dialog, noun
self-dialogue, noun
underdialogue, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dialogue or dialog (ˈdaɪəˌlɒɡ)
1.  conversation between two or more people
2.  an exchange of opinions on a particular subject; discussion
3.  the lines spoken by characters in drama or fiction
4.  a particular passage of conversation in a literary or dramatic work
5.  a literary composition in the form of a dialogue
6.  a political discussion between representatives of two nations or groups
7.  (tr) to put into the form of a dialogue
8.  (intr) to take part in a dialogue; converse
[C13: from Old French dialoge, from Latin dialogus, from Greek dialogos, from dialegesthai to converse; see dialect]
dialog or dialog
[C13: from Old French dialoge, from Latin dialogus, from Greek dialogos, from dialegesthai to converse; see dialect]
dialogic or dialog
'dialoguer or dialog

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., "literary work consisting of a conversation between two or more people," from O.Fr. dialoge, from L. dialogus, from Gk. dialogos, related to dialogesthai "converse," from dia- "across" + legein "speak" (see lecture). Sense broadened to "a conversation" c.1400.
Mistaken belief that it can only mean "conversation between two persons" is from confusion of dia- and di-.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in its widest sense, the recorded conversation of two or more persons, especially as an element of drama or fiction. As a literary form, it is a carefully organized exposition, by means of invented conversation, of contrasting philosophical or intellectual attitudes. The oldest known dialogues are the Sicilian mimes, written in rhythmic prose by Sophron of Syracuse in the early 5th century BC. Although none of these has survived, Plato knew and admired them. But the form of philosophic dialogue that he perfected by 400 BC was sufficiently original to be an independent literary creation. With due attention to characterization and the dramatic situation from which the discussion arises, it develops dialectically the main tenets of Platonic philosophy. To Lucian in the 2nd century AD the dialogue owes a new tone and function. His influential Dialogues of the Dead, with their coolly satirical tone, inspired innumerable imitations in England and France during the 17th and 18th centuries, e.g., dialogues by the French writers Bernard de Fontenelle (1683) and Francois Fenelon (1700-12).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
This dialogue itself serves as evidence of the sort of rich conversation that
  was impossible a decade ago.
The exhibit considers how designers seek to enable a nonverbal dialogue through
  clever design.
The picture shows on a small screen and the technician can run it frame by
  frame as he listens to the dialogue.
Even if the generals do release her, they have made it abundantly clear that
  they are not interested in dialogue.
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