ing

from The Century Dictionary.

• noun A suffix of Anglo-Saxon origin, the regular formative of the English present participle of verbs, as in coming, blowing, hearing, leading, etc., such participles being often used as ordinary adjectives, as in ‘the coming man,’ ‘a leading citizen,’ ‘a charming woman,’ etc.
• noun A meadow; especially, a low meadow near a river. The word is found in some local names, as Ingham, Ingthorpe, Dorking, Deeping, Wapping, etc.
• noun A suffix of Anglo-Saxon origin, usually forming nouns from verbs, expressing the action of the verb.
• noun A suffix of nouns, denoting origin, and hence a common patronymic, remaining in some English family or local names and having usually a derivative or patronymic force, ‘son of …,’ as in Anglo-Saxon Billing, son of Bill (literally, ‘a sword’); Beorming, son of Beorm; Æthelwulfing, son of Ethelwulf; æthling, son of a noble, etc.
• noun An apparent suffix in some local names, being ing, a meadow, in composition, as in Dorking, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun Obs. or Prov. Eng. A pasture or meadow; generally one lying low, near a river.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A water meadow
• noun The name of the letter for the ng sound IPA: /ŋ/ in Pitman shorthand.