Definition of "yes"

Used to show agreement or acceptance.  quotations  examples

Used to indicate disagreement or dissent in reply to a negative statement.  examples

(humorous) Answer to a question presuming one answer when all answers are correct.  examples

An exclamation of pleasure or approval, usually transcribed with an exclamation point.  examples

Response that confirms that the user is paying attention.  examples

(interrogative) Used to ask for more information with a request.  examples

An affirmative expression; an answer that shows agreement or acceptance.  examples

A vote of support or in favor/favour of something.  examples

(colloquial, transitive) to agree with, affirm, approve.  quotations  examples

(slang) to attempt to flatter someone by habitually agreeing