–s. 1. [OE. es, AS. as.] The suffix used to form the plural of most words; as in roads, elfs, sides, accounts.
2. [OE. -s, for older -th, AS. -ð.] The suffix used to form the third person singular indicative of English verbs; as in falls, tells, sends.
3. An adverbial suffix; as in towards, needs, always, — originally the genitive, possesive, ending. See -'s.