a written composition in which two or more characters are represented as conversing; a conversation between two or more persons; also : a similar exchange between a person and something else (such as a computer); an exchange of ideas and opinions… See the full definition| www.merriam-webster.com
any member of a class of words that typically can be combined with determiners to serve as the subject of a verb, can be interpreted as singular or plural, can be replaced with a pronoun, and refer to an entity, quality, state, action, or concept… See the full definition| www.merriam-webster.com