s
/ĕs/
noun
  1. The 19th letter of the modern English alphabet.
  2. Any of the speech sounds represented by the letter s.
  3. The 19th in a series.
from The American Heritage® Dictionary of the English Language, 5th Edition. More at Wordnik

Both express possession, of course.

We use 's with singular nouns. For example, "my son's toys" will be "the toys that belong to my son".

We use only an apostrophe (') after plural nouns that end in -s: "my sons' toys" means that I have more than one son and these are their toys.

We use 's for possession with the other plural nouns. For example: "my children's toys; women's wishes, etc.

Answer from fluffy on Stack Exchange
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Encyclopedia Britannica
britannica.com › dictionary › -'s
-'s Definition & Meaning | Britannica Dictionary
-'S meaning: used to form the possessive of singular nouns, of plural nouns not ending in s, of some pronouns, and of word groups that function as nouns or pronouns
People also ask

Is its or it’s possessive?
Its and it’s are often confused, but its (without apostrophe) is the possessive form of “it” (e.g., its tail, its argument, its wing). You use “its” instead of “his” and “her” for neuter, inanimate nouns.
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scribbr.com
scribbr.com › home › when to use its vs. it’s | examples, meaning & quiz
When to Use Its vs. It’s | Examples, Meaning & Quiz
When do you use its vs. it’s?
Though they’re pronounced the same, there’s a big difference in meaning between its and it’s. · Its (without an apostrophe) is the possessive form of it, so it means “belonging to it.” · “The cat ate its food.” · It’s (with an apostrophe) is a contraction (shortened form) of it is or it has. · “It’s almost Christmas.” ·
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scribbr.com
scribbr.com › home › when to use its vs. it’s | examples, meaning & quiz
When to Use Its vs. It’s | Examples, Meaning & Quiz
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WordReference
wordreference.com › english dictionary › -s
-s - WordReference.com Dictionary of English
-s - WordReference English dictionary, questions, discussion and forums. All Free.
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TheFreeDictionary.com
thefreedictionary.com › -s
-s - definition of -s by The Free Dictionary
[Middle English (north) -(e)s, Old English (north); orig. ending of 2nd pers. singular; replacing Middle English, Old English -eth -eth1] ... an ending marking nouns as plural (weeks; days; minutes), occurring also on nouns that have no singular ...
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Longman
ldoceonline.com › dictionary › s_2
S | meaning of S in Longman Dictionary of Contemporary English | LDOCE
S. presidential election.• ... million, the U. S.• At the high point of the sessions, the representative of the U. S.SS2 1 the written abbreviation of south or southern 2 the written abbreviation of small, used on clothes to show the size-s-s /z, s/ suffix 1 XXforms ...
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Scribbr
scribbr.com › home › when to use its vs. it’s | examples, meaning & quiz
When to Use Its vs. It’s | Examples, Meaning & Quiz
October 17, 2023 - Though they’re pronounced the same, there’s a big difference in meaning between its and it’s. Its (without an apostrophe) is the possessive form of it, so
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EzAITranslate
ezaitranslate.com › ai-dictionary › word-cw
s in English - Definition | AI Dictionary | EzAITranslate
2 weeks ago - From the Phoenician letter shin, through the Greek sigma (Σ, σ) and the Latin S. The modern English 'S' retains a shape similar to its ancient Semitic, Greek, and Roman ancestors. The letter 'S' is widely used in various symbols and abbreviations; for example, 'S' often denotes 'South' on compasses and maps, and 'S' is famously associated with Superman in popular culture.
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Collins Dictionary
collinsdictionary.com › us › dictionary › english › s_1
S definition in American English | Collins English Dictionary
33 senses: 1. the 19th letter and 15th consonant of the modern English alphabet 2. a speech sound represented by this letter,.... Click for more definitions.
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Homework.Study.com
homework.study.com › explanation › what-does-s-mean-in-grammar.html
What does "s" mean in grammar? | Homework.Study.com
Conjugating a word means to change its form in order to change its grammatical meaning. Conjugating sometimes involves simply adding a letter to the end of a word. Other times, it involves changing several letters. Become a Study.com member to unlock this answer! Create your account View this answer · In English, the letter "s" has three functions.
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Cambridge Dictionary
dictionary.cambridge.org › dictionary › english › apostrophe
APOSTROPHE | English meaning - Cambridge Dictionary
3 weeks ago - the symbol ’ used in writing to show when a letter or a number has been left out, as in I'm (= I am) or '85 (= 1985), or that is used before or after s to show possession, as in Helen's house or babies' hands: "It's" with an apostrophe means "it is" or "it has".
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Quora
quora.com › What-is-the-difference-between-s-and-s-in-English
What is the difference between 's and s' in English? - Quora
Answer (1 of 26): In English, the use of -'s is used in two ways: 1) to show that a letter (or letters) has been omitted from a word, (what's up?) or 2) to indicate possession. The use of -s' almost always indicates possession.
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Stack Exchange
ell.stackexchange.com › questions › 143276 › meaning-of-s-in-a-word
grammar - Meaning of (s) in a word - English Language Learners Stack Exchange
September 27, 2017 - american-english · Share · Improve ... 10311 gold badge11 silver badge33 bronze badges 4 · 2 · '(s)' indicates that there is a possibility of a plural existence....
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Cambridge Dictionary
dictionary.cambridge.org › us › dictionary › english › s
S, s | definition in the Cambridge English Dictionary
4 weeks ago - S, s meaning: 1. the 19th letter of the English alphabet 2. written abbreviation for South: 3. abbreviation for…. Learn more.
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Dictionary.com
dictionary.com › browse › s
S Definition & Meaning | Dictionary.com
November 20, 2025 - S definition: satisfactory. See examples of s used in a sentence.
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HiNative
hinative.com › questions › 1597996
What is the meaning of ""'s""? - Question about English (US)
January 14, 2017 - HiNative is a global Q&A platform where you can ask people from all over the world questions about language and culture. We support over 110 languages.
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Etymonline
etymonline.com › word › 's
's - Etymology, Origin & Meaning
By a process of popular interpretation, the 's was supposed to be a contraction for his, and in some cases the his was actually "restored." [Samuel C. Earle, et al, "Sentences and their Elements," New York: Macmillan, 1911] As a suffix forming some adverbs, it represents the genitive singular ending of Old English masculine and neuter nouns and some adjectives.