's Definition in the Cambridge English Dictionary
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Definition of “'s” - English Dictionary

Definition of "S." - American English Dictionary

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S.adjective, noun [U]

(also So.)
abbreviation for south or southern

Snoun [C]

(plural S’s, Ss, s’s or ss) (also s)  us   /es/
the 19th ​letter of the ​Englishalphabet

Sadjective [not gradable]

abbreviation for small Note: Used esp. on clothing to show its size.
(Definition of S. from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "'s" - British English Dictionary

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's

uk   us   /-s/ /-z/
short form of is: It's in the ​cupboard. short form of has: She's gone ​home. informal short form of does (only used in ​spokenquestions): How's this thing ​work? short form of us (only used after "​let"): Let's go ​swimming this ​afternoon.

-s'suffix

uk   us   /-s/ /-z/
used to show that the ​following thing ​belongs to the ​people or things ​named: the ​girls' ​books employees' ​rights

-'ssuffix

uk   us   /-s/ /-z/
used to show that the ​following thing ​belongs to the ​person or thing ​named: the cat's ​tail Patricia's ​dress today's ​paper the children's ​shoes the ​housebelonging to the ​statedperson: The ​boys are at Katy's. UK the ​shopbelonging to the ​statedperson: I got it at the greengrocer's.

snoun

(also sec)

-ssuffix

uk   us   /-s/ /-z/ (also -es)
used to ​form the ​plural of ​nouns: books sandwiches
(Definition of 's from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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