Definitions from Wiktionary (playground)

▸ noun:  (outdoors) A large open space for children to play in, usually having dedicated play equipment (such as swings and slides).
▸ noun:  (figuratively) Any physical or metaphysical space in which a person or organization has free rein to do as they please.
▸ noun:  (programming) A sandbox for testing calls to an application programming interface.
▸ Also see playground

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