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I'd like to find a word to encompass multiple people who share the same birthday (but were not necessarily born in the same year):

Best wishes to my <birthday-sharing friends> for a wonderful day.

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    If they share parents and age as well you might call them twins :) – Born2Smile Sep 2 '15 at 17:57
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    After the edit this question no longer is a dup of the linked question. This question now asks what we can call people who were "all born on the same day of the year of any year" while that one asks about people born on the same day of the same year. – Jim Sep 2 '15 at 18:05
  • Apparently astrologers have a term for this, 'date-twins'. If the details are precisely the same then they call them astro-twins. You could perhaps bend that last one to your use. ---llewellyn.com/blog/2010/08/… – chasly from UK Sep 2 '15 at 18:06
  • 'Date-twins' sounds promising.... birthday mates (I made it up). – aparente001 Sep 4 '15 at 2:19
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connascent (kəˈneɪsənt) Definitions adjective born, produced, or growing simultaneously

I wonder if it can be used here ??...

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    This would work for unrelated persons born on the same day and the same year but not for the OP's needs. – cobaltduck Feb 5 '16 at 16:17
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Birthday twins

I have no citation, but have often heard this used to describe exactly what is asked: two or more, not necessarily related, born on the same day, regardless of year born. Other forms of the same construction are "astro twins," "astrology twins," and "star twins."

  • I downvoted your other two (bad) answers - but this one works for me. It is informal, but I don't think there is a formalized english term for this phrase. – jdf Sep 2 '15 at 23:53
  • @chillin The 'edit' has been kept intentionally there for people to use it. :) – Jony Agarwal Nov 2 '15 at 12:39
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You're not going to like this answer, but a mother is someone who always shares the birth days of her children. If she has three children, she has four birthdays, three of which she shares with her children who are always younger than her. I told you you wouldn't like it!

In common usage, a birthday carries one of several slightly different meanings:

  • the day a person was born
  • the anniversary of the day a person was born
  • the celebration on the day a person is born
  • the celebration on day of the anniversary of the day a person was born
  • the day of a birth
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    Changing the definition of birthday doesn't help the OP. – jdf Sep 2 '15 at 23:51
  • @jdfLemon No one has changed the definition of birthday. Thanks. – chillin Sep 3 '15 at 0:15
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Irish twins

What are Irish twins? Well, long story short, Irish twins are siblings that are born 12 or less months apart.

The strict definition of Irish twins encompases more than what the question specifies, however, it is a close enough answer to list, because Irish twins will not be the same age and could share the same birthday, only a year apart.

Further, though it could be applied to siblings born less than 12 months apart, far and away the most common use of the phrase Irish twins is to describe siblings exactly 12 months apart, but notably it is less commonly applied also to cousins with the same birthday, any relatives with the same birthday, and even close friends with the same birthday.

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    Irish twin is a slang (and possibly pejorative) term referring to siblings born less than 12 months apart. Suggesting it as an answer by way of the possibility that two irish twins could have the same birthday if we expand the definition to 12 months or less doesn't make it fit for what the OP is asking. – jdf Sep 2 '15 at 23:51

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