Definition of Birth in the Dictionary of law (1889) 

We do not follow their deinitions, of course Yet this is interesting
to note. It also explains quite  a lot about our birth certificates.

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It is interesting to know when you look up the word birth in a dictionary of law (1889). it tells us to see Abandon 2(2)the word Abandon 
in section 2(2) as defined by a dictionary of law (1889) using these exact words. "the act lof a parent in exposing an infant