If you're in an ongoing discussion with someone over, say, the best way to train a dog, that means you talk to each other over a long period of time, about all the aspects of dog training.

Discussion comes from the Latin for "examination by taking things apart," and when you're having a discussion with someone on a complicated topic, it's like you're taking it apart and trying to understand it. Usually in a discussion, people exchange ideas. If you say, "I adore bananas," and your friend says, "me too," that's hardly a discussion. But if your friend says, "bananas are disgusting," then you can get into a discussion about it.

Definitions of discussion

n an extended communication (often interactive) dealing with some particular topic

“the book contains an excellent discussion of modal logic”
discourse, treatment
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extended treatment of particulars
a lengthy discussion (spoken or written) on a particular topic
a discussion of a topic (as in a meeting)
discussion; (`talk about' is a less formal alternative for `discussion of')
elaboration, enlargement, expansion
a discussion that provides additional information
a discussion (spoken or written) that enlarges on a topic or theme at length or in detail
a consideration of a topic (as in a meeting) with a view to changing an earlier decision
embellishment, embroidery
elaboration of an interpretation by the use of decorative (sometimes fictitious) detail
Type of:
communicating, communication
the activity of communicating; the activity of conveying information

n an exchange of views on some topic

“we had a good discussion
give-and-take, word
Strategic Arms Limitation Talks
negotiations between the United States and the Union of Soviet Socialist Republics opened in 1969 in Helsinki designed to limit both countries' stock of nuclear weapons
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argument, argumentation, debate
a discussion in which reasons are advanced for and against some proposition or proposal
(usually plural) discussion of all sides of a question
conference, group discussion
a discussion among participants who have an agreed (serious) topic
panel discussion
discussion of a subject of public interest by a group of persons forming a panel usually before an audience
post-mortem, postmortem
discussion of an event after it has occurred
public discussion, ventilation
free and open discussion of (or debate on) some question of public interest
dialogue, negotiation, talks
a discussion intended to produce an agreement
argument about words or the meaning of words
a negotiation between enemies
bull session
an informal discussion (usually among men)
a conversation especially a formal one
a conference between two or more people to consider a particular question
audience, consultation, interview
a conference (usually with someone important)
huddle, powwow
(informal) a quick private conference
news conference, press conference
a conference at which press and tv reporters ask questions of a politician or other celebrity
pretrial, pretrial conference
(law) a conference held before the trial begins to bring the parties together to outline discovery proceedings and to define the issues to be tried; more useful in civil than in criminal cases
round table, round-table conference, roundtable
a meeting of peers for discussion and exchange of views
a meeting for execution of a group's functions
an extended session (as on a college campus) for lectures and discussion on an important and usually controversial issue
teleconference, teleconferencing
a conference of people who are in different locations that is made possible by the use of such telecommunications equipment as closed-circuit television
diplomacy, diplomatic negotiations
negotiation between nations
the negotiation of the terms of a transaction or agreement
collective bargaining
negotiation between an employer and trade union
horse trading
negotiation accompanied by mutual concessions and shrewd bargaining
a negotiation to resolve differences that is conducted by some impartial party
Type of:
language, oral communication, speech, speech communication, spoken communication, spoken language, voice communication
(language) communication by word of mouth

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