Epergesis (e-per-gee’-sis): Interposing an apposition, often in order to clarify what has just been stated.
When my new Roomba 700, the robo-vacuum, showed up late last night I was slightly alarmed.
At 11:00 pm the doorbell rang. I opened the door and there there was Roomba, all charged up and sweetly humming on the stoop. I let Roomba in. We had a drink.
It was late. Roomba put me to bed, and went to work sucking the dirt out of the filthy shag carpet in my man cave.
As Roomba’s sweetly droning hum sent me off to sleepy land, I thought, I love you Roomba, nighty-night.
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Definition courtesy of “Silva Rhetoricae” (rhetoric.byu.edu).