the night of a person's birth, especially a birthday celebration for royalty.
the anniversary of such a date.
the celebration of a royal birthday.

Origin of birthnight

First recorded in 1620–30; birth + night Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for birthnight

Historical Examples of birthnight

  • We three were of the birthnight party—Eldershawe, Chris, and me.

    His Grace of Osmonde

    Frances Hodgson Burnett

  • "The hero of a birthnight is no more to be denied than the King himself," she said, turning for a last smile at her court.

    Sir Christopher

    Maud Wilder Goodwin

  • It was night at Boston, the birthnight of one of the leading events in the history of the world.

  • This was my first entrance into fashionable life at one of Madame Bodisco's birthnight balls.

  • How gladly would I have recompensed the forester who lit up a brake on my birthnight, which else had warmed him half the winter!