S – definition of S by The Free Dictionary

s ( ɛs) or S n, pl s’s, S’s or Ss 1. (Linguistics) the 19th letter and 15th consonant of the modern English alphabet 2. (Phonetics & Phonology) a speech sound represented by this letter, usually an alveolar fricative, either voiceless, as in sit, or voiced, as in dogs 3. a. something shaped like an S b. ( in combination ): an S-bend in a road. s

https://www.thefreedictionary.com/S