What is the meaning of -um?

Denotes singular grammatical number.

Forms the ends of the names of certain elements (such as molybdenum and platinum).

Denotes transitive verbs in the trade pidgins used between English-speakers and indigenous populations; used derogatorily by extension in English by addition to any verb, transitive or not.

Indicates a transitive verb

used to form nouns, usually with a collective and pejorative connotation

denotes singular grammatical number of words of Latin origins

generally unproductive suffix found in neuter nouns of Latin origin

a placename suffix, often an alternative form of -heim

A distinguishable foreign word-ending in nouns of Latin origin. It is not considered an independent Hungarian suffix.

Used to form the dative plural of most nouns, all strong adjectives and most pronouns.

Used to form the first person plural of verbs in the indicative and subjunctive, past and present.

Used to form some adverbs from nouns or adjectives — it is actually a frozen dative

inflection of -us:

  1. accusative masculine singular
  2. nominative/accusative/vocative neuter singular

accusative masculine singular

nominative/accusative/vocative neuter singular

genitive plural ending

  1. Found in -ōrum
  2. Found in -ārum
  3. genitive plural of -s

Found in -ōrum

Found in -ārum

genitive plural of -s

Used to form the dative plural of essentially all nouns

Used to form the strong and weak dative and instrumental plural of adjectives

Used to form the strong dative singular of masculine and neuter adjectives

me

Used to form the dative plural of essentially all nouns and adjectives, as well as most pronouns

Used to denote the 1st person plural forms in the active indicative and imperative forms of most verbs

First person singular suffix

Indicates a transitive verb

suffix used in singular forms of Latin neuter borrowings

Used to form adverbs.

Added to nouns or verbs to form nouns with diminutive or hypocoristic force

ending used for some words of Latin origin

First-person singular possessive suffix denoting singular possession in words ending in a consonant.

Conjugation of the verb "to be" for first person singular simple present tense.

Used to form the comparative form of adjectives.

Source: wiktionary.org