conversation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The exchange of thoughts and feelings by means of speech or sign language.
• noun An instance of this.

from The Century Dictionary.

• noun General course of actions or habits; manner of life; behavior: deportment, especially with respect to morals. [Obsolescent.]
• noun Familiar intercourse; intimate acquaintance or association; commerce in social life. [Obsolescent.]
• noun Familiar acquaintance from using or studying.
• noun Informal interchange of thoughts and sentiments by spoken words; informal or familiar talk.
• noun A meeting for conversation, especially on literary subjects; a conversazione.
• noun Sexual intercourse: as, criminal conversation (which see, under criminal).

from the GNU version of the Collaborative International Dictionary of English.

• noun Archaic General course of conduct; behavior.
• noun Familiar intercourse; intimate fellowship or association; close acquaintance.
• noun obsolete Commerce; intercourse; traffic.
• noun Colloquial discourse; oral interchange of sentiments and observations; informal dialogue.
• noun Sexual intercourse.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun fencing The back-and-forth play of the blades in a bout.
• noun computing The protocol-based interaction between systems processing a transaction.
• verb nonstandard, transitive, intransitive To engage in conversation (with).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the use of speech for informal exchange of views or ideas or information etc.