Definitions from Wiktionary (S)

▸ noun:  (set theory) An axiomatic set theory, developed by logician George Boolos, in which several of the axioms of ZF are derivable as theorems.
▸ noun:  (metrology) Abbreviation of scruple. (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.]
▸ noun:  (physics) Abbreviation of strange quark. [(physics) A quark having a fractional electric charge of -1/3 and a mass of about 80 to 130 MeV.]
▸ noun:  Alternative form of s.
▸ noun:  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.]
▸ noun:  Initialism of season (group of episodes of a series). [Each of the four divisions of a year: spring, summer, autumn (fall) and winter]
▸ noun:  (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.]
▸ noun:  (music) Initialism of soprano. [The musical part higher in pitch than alto, typically encompassing the range of the treble clef.]
▸ noun:  (television) Initialism of subtitles.
▸ noun:  (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").]
▸ adjective:  (usually clothing) Initialism of small (of the manufactured size). [Not large or big; insignificant; few in number.]

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