's: 1. an ending used in writing to represent the possessive morpheme after most singular nouns, some plural nouns, especially those not ending in a letter or combination of letters representing an s or z sound, noun phrases, and noun substitutes, as in man's, women's, baby's, James's, witness's, (or witness' ), king of England's, or anyone's.S Phase‧Salubrious‧Fettle‧Complexion‧Eupepsia‧Hardiness.