-ing

1. 1. Action, process, or art: dancing.
   2. An instance of an action, process, or act: a gathering.
2. An action or process connected with a specified thing: berrying.
3. 1. Something necessary to perform an action or process: mooring.
   2. The result of an action or process: a drawing.
   3. Something connected with a specified thing or concept: siding; offing.

[Middle English, from Old English -ung, -ing.]