There are 3 main definitions of -ing in English:

-ing1

suffix

1Denoting a verbal action, an instance of this, or its result: fighting outing building
1.1Denoting a verbal action relating to an occupation, skill, etc. banking ice skating welding
2Denoting material used for or associated with a process etc. cladding piping
2.1Denoting something involved in an action or process but with no corresponding verb: sacking
3Forming the gerund of verbs (such as painting as in I love painting).

Origin

Old English -ung, -ing, of Germanic origin.

Definition of -ing in:

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There are 3 main definitions of -ing in English:

-ing2

suffix

1Forming the present participle of verbs: doing calling
2Forming adjectives from nouns: hulking

Origin

Middle English: alteration of earlier -ende, later -inde.

Definition of -ing in:

There are 3 main definitions of -ing in English:

-ing3

suffix

(Used especially in names of coins and fractional parts) a thing belonging to or having the quality of: farthing riding

Origin

Old English, of Germanic origin.

Definition of -ing in: