Adverb
in a rhetorical manner; pertaining to rhetoric
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Sense 1: used to describe something that is expressed or done for rhetorical effect, rather than with the intention of being answered or acted upon.
 He rhetorically asked if anyone could find a flaw in his plan. She rhetorically stated that it was impossible to please everyone. 
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Sense 2: used to emphasize the use of language effectively and persuasively.
 The politician skillfully used rhetorically powerful statements during his speech. The speaker passionately delivered their message rhetorically, captivating the audience.