Refers to a garden or landscaped grounds, often of a temple, shrine, or traditional residence.
お寺の園庭には美しい池がある。
The temple garden has a beautiful pond.
kindergarten yard; playground
Specifically the outdoor play area of a kindergarten or nursery school.
子どもたちは園庭で元気に走り回っている。
The children are running around energetically in the kindergarten yard.
kindergarten playground open day
Compound of 園 (garden, park) and 庭 (garden, yard). The reading is on'yomi for both characters.