S

1. (n) (set theory) An axiomatic set theory, developed by logician George Boolos, in which several of the axioms of ZF are derivable as theorems. 2. (n) Alternative form of s.. 3. (n) (physics) Abbreviation of strange quark. [(particle physics) A quark having a fractional electric charge of -1/3 and a mass of about 80 to 130 MeV.] 4. (n) (metrology) Abbreviation of scruple, a unit of mass in the apothecaries' system. [Hesitation to act from the difficulty of determining what is right or expedient; doubt, hesitation or unwillingness due to motives of conscience; moral qualm.] 5. (n) Initialism of south. [The direction towards the pole to the right-hand side of someone facing east, specifically 180°, or (on another celestial object) the direction towards the pole lying on the southern side of the invariable plane.] 6. (n) Initialism of season (group of episodes of a series). [Each of the four divisions of a year: spring, summer, autumn (fall) and winter] 7. (n) (usually clothing) Initialism of small (the manufactured size or an item of that size). [(uncountable, especially clothing, food or drink) One of several common sizes to which an item may be manufactured.] 8. (n) (music) Initialism of soprano. [The musical part higher in pitch than alto, typically encompassing the range of the treble clef.] 9. (n) (television) Initialism of subtitles. 10. (adj) (education) Initialism of satisfactory. [Done to satisfaction; adequate or sufficient.] 11. (n) (American Library Association) Initialism of sextodecimo (book size, 15-17.5 cm in height). [(paper, printing) A size of a sheet of paper resulting from folding and cutting a sheet of paper into sixteenths (3.25"–5" x 5"–6.25").] 12. (adj) (usually clothing) Initialism of small (of the manufactured size). [Not large or big; insignificant; few in number.]