World English Dictionary
unbirthday (ˌʌnˈbɜːθdeɪ)
jocular (Brit)
 a.  any day other than one's birthday
 b.  (as modifier): an unbirthday present
[C19: coined by Lewis Carroll in Through the Looking-Glass]

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Main Entry:  unbirthday
Part of Speech:  n
Definition:  any day that is not one's birthday
Example:  I received an unbirthday present!
Etymology:  1871; fr Lewis Carroll's "Through the Looking Glass"
Usage:  humorous
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