Used to form regular plurals of nouns. / Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).

Used to form the third-person singular indicative present tense of verbs.

Used in the formation of certain English adverbs.

(informal, colloquial, sometimes humorous) Hypocoristic suffix

plural of A+

The nineteenth letter of the English alphabet, called ess and written in the Latin script.

(set theory) An axiomatic set theory, developed by logician George Boolos, in which several of the axioms of ZF are derivable as theorems.

(physics) subatomic particles with a spin (quantum angular momentum) of 0, predicted by supersymmetry; the bosonic equivalent of known fermions

(organic chemistry) secondary form

(Internet slang, tone indicator) Denotes that the preceding statement is sarcastic.