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Greek-letter fraternity

[greek-let-er]
noun
  1. a fraternity whose name consists usually of two or three Greek letters, as Sigma Delta Phi (ΣΔΦ).
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Origin of Greek-letter fraternity

An Americanism dating back to 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018