WordWeight : Weighing the Words

Pronunciation : -s.
Definition : 1. Etym: [OE. es, AS. as.]

Defn: The suffix used to form the plural of most words; as in roads, elfs, sides, accounts.

2. Etym: [OE. -s, for older -th, AS. -th.]

Defn: The suffix used to form the third person singular indicative of English verbs; as in the falls, tells, sends.

3. An adverbial suffix; as in towards, needs, always, -- originally the genitive, possesive, ending. See -'s.
Source : Webster's Unabridged Dictionary, 1913