plural of birthday suit

Third-person singular simple present indicative form of happy birthday

simple past tense and past participle of happy birthday

present participle of happy birthday

plural of half birthday

Alternative form of half birthday

The day halfway in between two consecutive birthdays.

plural of half-birthday

A party held to celebrate a person's birthday.

(statistics) A statistical phenomenon where an individual's likelihood of death appears to increase on or close to their birthday, variously attributed to alcohol consumption, psychological stress, increased suicide risk, and other factors.