Meaning of -'S in English



suffix denoting the possessive case of singular nouns and of plural nouns not ending in -s (John's book; the book's cover; the children's shoes).

Etymology: OE genit. sing. ending 2.

suffix denoting the plural of a letter or symbol (S's; 8's).

Etymology: as -S(1)

Oxford English vocab.      Оксфордский английский словарь.