monoprogeny
n.— «Three of my closest friends are also only children and, now in our mid-30s, we have been supporting and feuding with each other in a proto-sibling way since meeting at university. We realised this a few years ago, when a boyfriend commented on the tendency of monoprogeny—his disapproving coinage—to huddle together.» —“Plays well with others?” by Miranda Green Financial Times (United Kingdom) May 4, 2007. (source: Double-Tongued Dictionary)
Further reading
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