Definition

1. Noun:
   • The specific calendar date on which a person was born: This refers to the day, month, and year of a person's origin.
   • The annual celebration or anniversary of the day a person was born: This refers to the commemoration or party held on the recurring date of one's birth.

Usage and Examples

• Noun:
  • My birthday is on March 15th. (This states the specific date of birth.)
  • We are having a party for her birthday. (This refers to the celebration event.)
  • He received many cards on his birthday. (This refers to the anniversary day itself.)

Advanced Usage and Nuances

• "In one's birthday suit" (idiom, humorous): A euphemism meaning to be completely naked.
  • The toddler ran through the sprinkler in his birthday suit.

Variants and Related Words

• Birthday boy/birthday girl (noun phrase): A person, typically a child, who is celebrating their birthday.
  • The birthday girl blew out the candles on her cake.
• Birthday card (noun): A greeting card given to someone on their birthday.
• Birthday cake (noun): A cake, often decorated with candles, served at a birthday celebration.
• Birthday present/birthday gift (noun): A present given to someone to celebrate their birthday.

Synonyms

• Natal day (formal/literary): The day of one's birth.
• Date of birth: The specific day, month, and year someone was born (more formal, often for documents).

Idioms and Phrases

• "Happy birthday to you!": The conventional phrase sung or said to someone on their birthday.
• "Many happy returns (of the day)": A traditional birthday greeting wishing someone many more birthdays to come.

Noun

1. the date on which a person was born
2. an anniversary of the day on which a person was born (or the celebration of it)