English: planning gain
Welsh: lles cynllunio
Subject: Cynllunio
English definition: The principle of a developer agreeing to provide additional benefits or safeguards, often for the benefit of the community, usually in the form of related development supplied at the developer's expense.
Welsh definition: Egwyddor datblygwr yn cytuno i ddarparu buddiannau neu warantiadau ychwanegol, yn aml er lles - y gymuned, fel arfer ar ffurf datblygiad cysylltiedig a gyflwynir ar gost y datblygwr.