half birthday

== English == === Alternative forms === half-birthday === Etymology === From half +‎ birthday. === Pronunciation === === Noun === half birthday (plural half birthdays) The day halfway in between two consecutive birthdays. 2003, Meg Cox, The Book of New Family Traditions, page 263: You can sing "Happy Half Birthday to You!" or you could try only singing every other word. 2004, Ginnie Mesibov, Outer Strength, Inner Strength, page 39: The fete was Mary Beth's half-birthday. 2009, Philip Done, Close Encounters of the Third-Grade Kind: Thoughts on Teacherhood: “Your halfbirthday?” I pointed to the plate.