There are 2 definitions of -'s in English:

-'s1

Syllabification: -'s

suffix

Denoting possession in singular nouns, also in plural nouns not having a final -s: the car’s engine Mrs. Ross’s son the children’s teacher

Origin

Old English, masculine and neuter genitive singular ending.

Definition of -'s in:

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Word of the day premonition
Pronunciation: ˌprēməˈniSHən
noun
a strong feeling that something will happen …

There are 2 definitions of -'s in English:

-'s2

Syllabification: -'s

suffix

Denoting the plural of a letter or symbol: T’s 9's

Usage

In the formation of plurals of regular nouns, it is incorrect to use an apostrophe: six pens (not six pen’s). There are a few special occasions, however, in which the apostrophe indicates plurals, as with letters and symbols where s added without punctuation would look odd (or be undecipherable): ABC’s; the five W’s; dot your i’s and cross your t’s; the code is two H’s followed by four #’s.

Definition of -'s in:

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Word of the day premonition
Pronunciation: ˌprēməˈniSHən
noun
a strong feeling that something will happen …