Pronunciation IPA (key): /s/ or /z/ or /ʒ/ Audio (US)(file) Noun LetterS or s The letter S The nineteenth (19th) letter of the alphabet. "s" comes after "r" and before "t" Usage notes The letter s added to the end of a noun (object word) generally makes it a plural. The letter s added to the end of a verb (doing word) generally makes it a 3rd person singular form. Letters of the Alphabet A a - B b - C c - D d - E e - F f - G g - H h - I i - J j - K k - L l - M m N n - O o - P p - Q q - R r - S s - T t - U u - V v - W w - X x - Y y - Z z Abbreviation Abbreviations S is short for south or southern.Wikiwand - on Seamless Wikipedia browsing. On steroids.