Definition of birthday. Meaning of birthday. Synonyms of birthday

- A birthday is the anniversary of the birth of a person, or figuratively of an institution. Birthdays of people are celebrated in numerous cultures, often...
- "Happy Birthday to You", or simply "Happy Birthday", is a song traditionally sung to celebrate a person's birthday. According to the 1998 Guinness World...
- theory, the birthday problem asks for the probability that, in a set of n randomly chosen people, at least two will share a birthday. The birthday paradox...
- Buddha's Birthday or Buddha Day (also known as Buddha Jayanti, Buddha Purnima, and Buddha Pournami) is a primarily Buddhist festival that is celebrated...
- The King's Official Birthday is the selected day in most Commonwealth realms on which the birthday of the monarch is officially celebrated in those countries...
- birthday in Wiktionary, the free dictionary. Happy Birthday may refer to: "Happy birthday", an expression of good will offered on a person's birthday...
- Look up birthday party in Wiktionary, the free dictionary. A birthday party is a party to celebrate the anniversary of someone's birth. Birthday Party or...
- The birthday effect (sometimes called the birthday blues, especially when referring specifically to suicide) is a statistical phenomenon where an individual's...
- Birthday Girl may refer to: "Birthday Girl" (short story), by Haruki Murakami, 2002 Birthday Girl (2001 film), an erotic comedy thriller directed by Jez...
- The Birthday Honours, in some Commonwealth realms, mark the reigning British monarch's official birthday by granting various individuals appointment into...