Merriam-Webster Collegiate Dictionary - dialogue

 I. noun  also dialog  Etymology: Middle English dialoge, from Anglo-French ~, from Latin dialogus, from Greek dialogos, from dialegesthai to converse, from dia- + legein to speak — more at legend  Date: 13th century  1. a written composition in which two or more characters are represented as conversing  2.  a. a conversation between two or more persons; also a similar exchange between a person and something else (as a computer)  b. an exchange of ideas and opinions organized a series of ~s on human rights  c. a discussion between representatives of parties to a conflict that is aimed at resolution a constructive ~ between loggers and environmentalists  3. the conversational element of literary or dramatic composition very little ~ in this film  4. a musical composition for two or more parts suggestive of a conversation  II. verb  (-logued; -loguing)  Date: 1566  transitive verb to express in ~  intransitive verb to take part in a ~ managers dialoguing with employees