The emotional connotation of "dream" as used by King is the reference to his vision that one day, every race in America would be treated as equals. This is an example of the use of Pathos.
What effect does the repeated phrase "I have a dream" likely have on the listener?
The use of repetition as a literary device by Dr. King in his speech serves primarily to create emphasis on the dream.
It also serves a form of rhythm and helps to increase the emotive response to the speech.
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