-ing
{{11}}-ing (1) suffix attached to verbs to mean their action, result, product, material, etc., from O.E. -ing, -ung, from P.Gmc. *unga (Cf. O.N. -ing, Du. -ing, Ger. -ung). Originally used to form nouns from verbs and to denote completed or habitual action. Its use has been greatly expanded in Middle and Modern English.
{{12}}-ing (2) suffix used form the prp. of verbs, from O.E. -ende (Cf. Ger. -end, Goth. -and, Skt. -ant, Gk. -on, L. -ans). It evolved into -ing in 13c.-14c.

Etymology dictionary. 2014.

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