-'s

-'s1 [s, z after a vowel sound or voiced consonant, ɪz after a sibilant]
suffix denoting possession in singular nouns, also in plural nouns not having a final -s: John's book.
Origin
OE, masculine and neut. genitive singular ending.
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-'s2 [s, z after a vowel sound or voiced consonant, ɪz after a sibilant]
suffix denoting the plural of a letter or symbol: 9's.

English new terms dictionary. 2014.

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