DictionaryAI

birthday

SayBURTH-day/ˈbɝθˌdeɪ//ˈbɜːθ.deɪ/

Pluralbirthdays

Verbbirthdays, birthdaying, birthdayed

3 meanings of birthday

Practice

  1. 1
    anniversarynouncountable
    The day each year when someone was born or something began, or a party for that day.

    Like a yearly marker that comes back on the same date you arrived.

    We had cake and balloons for my little brother's birthday.

    Her birthday falls on the same day as the holiday.

    UsageSay on my birthday (not incorrect: in my birthday) and for my birthday for a present.

    Note
  2. 2
    date of birthnouncountable
    The exact date when someone was born or something was made, also called a birthdate.

    Please write your name and birthday on the form.

    She couldn't remember the exact birthday listed on his passport.

    UsageOn forms, people usually write date of birth or birthdate.

    Similarbirthdate

  3. 3
    verbcolloquialintransitive
    To celebrate the day you were born, often with friends and a party.

    Let's birthday at the lake this weekend.

    I'm birthdaying at the beach this year, so come along!

    UsageA fun, casual word: birthday at the beach. In serious writing, say celebrate a birthday.

Practice

Can you tell the meanings of birthday apart? Answer 4 quick questions from this page, or write your own sentence and AI will check it.

Origin

From an Old English word for "birthday," made from "birth" plus "day."

Checked 5 Nov 2026 · 2 facts