The English possessive isn’t a contraction, but rather a relic of the grammatical case system, so why is an apostrophe used in (most) forms of the possessive?
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Possible duplicate of: How did an apostrophe plus the letter “s” come to indicate possession?, Where did the practice of using apostrophes for possessive nouns but not pronouns originate, Origins of possessive pronouns – RegDwigнt♦ Jan 6 '13 at 15:06
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1Possible duplicate of Where did the practice of using apostrophes for possessive nouns but not pronouns originate? – jimm101 Jul 6 '18 at 10:31
The apostrophe came into English in the middle of the sixteenth century as a printer’s mark to indicate missing letters. Its use to indicate possession may in part have arisen from the fact that some, but by no means all, Old English nouns formed their genitive with the ending -es. The genitive of scip (‘ship’), for example, was scipes (‘of a ship’), and the apostrophe would have allowed printers to show shipes as ship’s. (By contrast, the genitive of nama ('name') was naman).
It’s probably more helpful to see the development of the apostrophe to indicate possession more generally as an arbitrary convention. That is certainly the case with the use of the terminal apostrophe, as in ships’, which was not established until the eighteenth century.
answered Jan 6 '13 at 9:04
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The genitive relative and possessive interrogative pronoun whose is a slightly interesting case, so to speak. :) – tchrist♦ Jan 6 '13 at 17:46
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Is who/whom/whose the best remaining example of declension in Modern English? The relationship with Latin qui/quem/cuius is striking. – David Garner Dec 17 '14 at 20:49
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@DavidGarner: Not such a good example; whom is moribund, more honored in the breach than the observance, while whose is no longer only human in reference like who and whom, but is extended to neuter and metaphoric possessives as well. There aren't many good paradigms left in English, though we used to have some cool ones. – John Lawler Sep 16 '17 at 16:33
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I hesitated to contradict John Lawler for whom I have great respect, but when I showed the previous clause to colleagues [London, UK, tech people] they agreed with me that it was normal, slightly-formal English that wouldn't look out of place in a work doc. So, moribund maybe, but not dead yet. As for 'whose', well, I was just drawing a parallel between English and Latin cases, because as an amateur I'm still amazed that these correspondences persist over millennia. – David Garner Sep 21 '17 at 14:51
According to wikipedia's article the apostrophe is used to mark the loss of the letter e that existed in old English to mark the genitive inflection.
Edit:
Here's an interesting post on this subject: The Possessive Apostrophe His Origin.
