What is the meaning of -s?

Used to form regular plurals of nouns.

Used to form many pluralia tantum (nouns that are almost or entirely without singular forms).

When appended to a number ending in at least one 0, expresses a range of numbers which share the digits before some or (usually) all of the 0s; frequently used for decades, centuries and temperatures.

Used to form the third-person singular indicative present tense of verbs.

Used in the formation of certain English adverbs.

Possessive marker, indicating that an object belongs to the word bearing the marker.

Alternative form of -'s

Hypocoristic suffix

Alternative spelling of 's

appended to the stem of a verb, this suffix yields a verbal noun

Used to form regular plurals of nouns that end in certain suffixes or syllables, such as -el, -er, -en, -em, -eur, -aar, -aard, diminutive -ie, etc.

Used to form irregular plurals of many other nouns, chiefly of foreign origin.

Used to form the partitive form of the adjective

Used to form adjectives of characteristic from nouns.

Used to form adjectives or language names from place names.

Forms agent nouns.

Used to emphasise that there are multiple instances of the noun

Alternative form of -si

Used to form genitive/possessive phrases, attached to the last word in a noun phrase.

Used to form regular plurals of nouns that end in certain suffixes or syllables, such as -el, -er, -en, -em, -eur, -aar, -aard, diminutive -je, etc.

Used to form irregular plurals of many other nouns, chiefly of foreign origin.

Used to form the genitive case of (strong) masculine and neuter nouns.

Used to form the genitive case of proper nouns and some pronouns.

Used to form the partitive form of the adjective

Used to form adjectives of characteristic from nouns.

Used to form adjectives or language names from names of nations or countries.

Used to form some adverbs

Used to form patronymic surnames.

creates adjectives from nouns

forms ordinal numbers from cardinal numbers

When appended to a second-person singular or plural imperative, gives the command or request slightly rude or impatient tone—often with different verbs and different independent particles adjacent, the tone is different.

When appended to the particle -pa/-pä that is appended to a second-person imperative, gives the command or request a slightly more persuasive or inspiring tone.

Mainly in informal contexts: a particle appended to an interrogative suffix -ko/-kö of the verb conjugated in order to bring the conversation partner or a person outside the conversation, talked about, emotionally closer to the speaker, or to create familiarity into the conversation; also to express that closeness or familiarity—sometimes very difficult to translate well into English, in some cases corresponds to tag questions.

appended to the shortened impersonal indicative present form (-n omitted) to soften the command or request or to make it more persuasive.

Softens interrogative words, particularly mikä, kuka and their inflected and derived forms, such as when the speaker expects the person addressed to know the answer.

Forms some nouns.

Forms fractional numbers from ordinal numbers.

Forms ordinal numbers from cardinal numbers, or ordinal pronouns.

Forms lative adverbs.

Alternative form of -ssa (inessive)

Used to form the regular plurals of most nouns and adjectives.

Used to form the irregular plurals of a few nouns and adjectives in -au, -eu (which regularly add -x) and in -al (which regularly make -aux).

Used to form the second-person singular of most verb conjugations.

Used to form the first-person singular of some verb conjugations.

used to form the genitive singular of most masculine nouns, neuter nouns, and proper nouns of all genders

used to form nouns from verb stems

Used to form the plurals of some nouns.

Used to form the plurals of personal names, particularly family names.

Used to form adverbs from substantives:

Sometimes used to form adverbs from adjectivess:

Added to a noun to form an adjective meaning "having something, a quality"; sometimes referred to as ornative.

Added to a noun to form an occupation or a collective noun.

Added to a cardinal number to form a digit or figure, cf. the relevant template.

Forms verbs with repetitive meaning. In today's Hungarian language, it is completely obsolete, and its old derivatives are also obscured, e.g. olvas (“to read”), keres (“to seek”), futos (“to run around”).

Used to form the inessive case; in, inside

Used to form ordinal numbers from cardinal numbers; -th

Used to mark the possession of the second person singular; thy, your

Used to form nouns from other nouns

Used to mark the possession of the second person; thy, your

Used to form the genitive case of (strong) masculine and neuter nouns.

Used to form the genitive case of proper nouns.

Used to form the partitive form of the adjective

Used to form adverbs

his, hers, theirs

Adverbial genitive ending, developed into the -ce at the end of some words

habitual verb suffix

1. in verbal nouns: -er
2. in adjectival verbs, indicates that the subject is not singular

in verbal nouns: -er

in adjectival verbs, indicates that the subject is not singular

Used to form the passive voice of verbs.

Used to form genitive/possessive phrases, attached to the last word in a noun phrase.

Feminine noun suffix forming nouns from adjectives and verbs

indicates a nominative singular of a masculine noun or adjective

indicates an oblique plural of a masculine noun or adjective

indicates a (nominative or oblique) plural of a feminine noun or adjective

Forms nouns from verbs, indicating the activity of the verb

appended to relative/interrogative pronouns to form indefinite pronouns

suffix marking the nominative singular form of non-neuter nouns and adjectives in declensions other than the first.

-self

Forms nouns indicating a material.

Forms nouns from numbers, indicating a group.

Forms adverbs of manner from adjectives.

Forms adverbs indicating direction or a span of time.

The ending of the locative singular case.

used to form the regular plural of nouns and adjectives, especially those that end in vowels

used to form slangier forms of certain words

Evidential suffix, second-hand information. Indicates that the speaker has not directly experienced the information at hand; hearsay

Used to form the regular plural of nouns and adjectives which end in vowels.

Used to form the passive voice of verbs.

Used to form the middle (reflexive and reciprocal) voice of verbs.

Used with certain transitive verbs, but without an object, to indicate a habitual or natural action.

Used to form the plural form of some words, mostly loanwords

Used to derive some adverbs from nouns or adjectives

suffix added in slang, especially in place of reduplication

Used to form plural nouns.

him, her, it, them

Source: wiktionary.org