/ es; NAmE / noun , abbreviation , symbol
■ noun
(also s ) [ C , U ] ( pl. Ss , S's , s's / ˈesɪz; NAmE /) the 19th letter of the English alphabet :
'Snow' begins with (an) S / 'S'.
—see also S-bend
■ abbreviation
1.
( pl. SS ) Saint
2.
(especially for sizes of clothes) small
3.
( NAmE also So. ) south; southern :
S Yorkshire
4.
siemens
—see also s and h
■ symbol
the symbol for entropy