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A person who has similar symptoms to that of an Only Child but is not necessarily an only child. Generally they are quiet, sensible and mature for their age, serious, kind, shy and slightly awkward, and don't get bored easily. This condition typically onsets in adolescence. It is difficult to imagine an only-child type living and interacting with a sibling, even if they do actually have a sibling.
1. "No way, dude, Emily has a sister? She's such an only-child type though!"
2. "Yeah, I knew you didn't have any siblings, you're an only-child type."
by whatwhatwhat77 March 21, 2012
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