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Meaning of birthnight

birth•night

Pronunciation: (bûrth'nīt"), [key]
— n.
  1. the night of a person's birth, esp. a birthday celebration for royalty.
  2. the anniversary of such a date.
  3. the celebration of a royal birthday.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.