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's

Source : Webster's Revised Unabridged Dictionary (1913)

-'s \-'s\ [OE. -es, AS. -es.] The suffix used to form the
   possessive singular of nouns; as, boy's; man's. 's \'s\
   A contraction for is or (colloquially) for has. ``My heart's
   subdued.'' --Shak.