Definitions for rhetorical question
Random House Webster's College Dictionary
a question asked solely for effect and not to elicit a reply, as “What is so rare as a day in June?”
Origin of rhetorical question:
a statement that is formulated as a question but that is not supposed to be answered
"he liked to make his points with rhetorical questions"
A question posed only for dramatic or persuasive effect.
A question to which the asker does not expect an answer.
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