Relating to or having the nature of a gerund; functioning as a gerund or connected to gerund usage.
From gerund + -ial (relating to). A technical grammatical term created in the 19th century to describe properties and features of gerunds in linguistic analysis.
The gerundial '-ing' form is so versatile it can mean both ongoing action ('the running man') and a specific thing you do ('running is fun'), which confuses non-native speakers endlessly.
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