UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbɜːrθdi/, /ˈbɜːrθdeɪ/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈbɝθˌdeɪ/ ,USA pronunciation: respelling(bûrthdā′)

WordReference Random House Learner's Dictionary of American English © 2020
birth•day /ˈbɜrθˌdeɪ/USA pronunciation   n. [countable]
  1. the anniversary of a birth:We had a birthday party for her.
  2. the day of a person's birth:My birthday is December 28.
  3. a day commemorating the founding or beginning of something:celebrating the birthday of our church.

WordReference Random House Unabridged Dictionary of American English © 2020
birth•day  (bûrthdā′),USA pronunciation n. 
  1. the anniversary of a birth.
  2. the day of a person's birth.
  3. a day marking or commemorating the origin, founding, or beginning of something.
  4. the festivities or celebration marking such a day or anniversary.
  • 1350–1400; Middle English; see birth, day

Collins Concise English Dictionary © HarperCollins Publishers::
birthday /ˈbɜːθˌdeɪ/ n
  1. an anniversary of the day of one's birth
  2. (as modifier): birthday present
  3. the day on which a person was born
'birthday' also found in these entries (note: many are not synonyms or translations):
Collocations: is her [first, 50th] birthday, [organize, put on, go to] a birthday party, it's my [Golden] Birthday!, more...

Forum discussions with the word(s) "birthday" in the title:

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