Noun. A person or persons you live in the same dorm building with, not necessarily a person you share the same dorm room with.
"My dormmates are banging really loud again"
"Who are they?"
"I don't know, we've never met they just live above me."
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Someone you live with in a college dorm or apartment. You must share living space and bathrooms with these people, and you might have never met them before -- showering and dressing can be awkward.
Dude #1: "Is that your roommate?"
Dude#2: "No, that's my dormmate. He pees on the toilet seat all the time!"
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