- -'s-'s1-'s[assimilated contr. < ME -es < OE, masc. & neut. gen. sing. inflection] suffix1. forming the possessive singular of most nouns and noun phrases and of some pronouns [a child's game, the defense attorney's case, the Senator from Maine's bill, one's own ideas]2. forming the possessive plural of nouns whose plural does not end in s [a children's dictionary]-'s2suffix1. is [he's here]2. has [she's done it]3. Informal does [what's it matter?]: Used in contractions-'s3suffixus: used with the verb let in the contraction let's
English World dictionary. V. Neufeldt. 2014.