Definition - A verb that has been turning into a noun by affixing -ing, e.g. Do you mind my thinking of you?

1. When the -ing form is used as a verb, it is called a present participle.
2. They are also called verb-nouns.

Etymology -
The word derives from the Old Latin gerundum, to be carried out (from Latin gerere, to bear or carry).

Oxford English Dictionary -
Its first citation is from 1513:
"There be moreouer belongyng to the infinitiue mode of verbes certayn voyces called gerundes
whiche haue bothe the actyue and passiue significacion."
(Lilly, Introduction to Grammar (1549), Bijb)

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