(metrology) Abbreviation of scruple. (unit of mass in the apothecaries' system) / (physics) Abbreviation of strange quark. / Alternative form of s.

(usually clothing) Initialism of small (of the manufactured size).

The ordinal number nineteenth, derived from this letter of the English alphabet, called ess and written in the Latin script.

Initialism of south. / Initialism of season (group of episodes of a series). / (usually clothing, singular only) Initialism of small (the manufactured size or an item of that size).

(business, often attributive) Initialism of sales and administration.

(UK, dialect) Contraction of as.

Contraction of is. / Contraction of has. / (proscribed, dialectal, Southern US) Contraction of was.

Contraction of us (found in the formula let’s which is used to form first-person plural imperatives).

(UK, dialect) Contraction of as (when it is (nonstandardly) used as a relative conjunction, or like a relative pronoun, meaning "that").

(on pronouns) Possessive marker, indicating that an object belongs to the word bearing the marker. / (on nouns, now nonstandard) Alternative form of -'s