One of the mysteries of the English language finally explained.
1Obstetrics. Of an infant: born after a pregnancy lasting significantly longer than normal; post-term. Of labour or birth: occurring after such a pregnancy.
2Relating to or designating a person or animal over the age of maturity; (Biology) relating to or designating an organism, cell, or other structure undergoing development which has passed the age or point of maturity.
Late 19th century. From post- + mature, after premature.
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