This is the 10201st most frequent Japanese word.
開園
"Opening of a park or garden."
Here, '開園' refers to the action of opening a park or garden to visitors. It is commonly used to indicate the opening hours.
公園は朝9時に開園します。
The park opens at 9 AM.
The word '開園' in this sentence refers to the day the park officially opened, emphasizing the moment of its inauguration.
記念イベントは開園の日に開催されました。
The commemorative event was held on the opening day of the park.
In this sentence, '開園時間' refers to the duration within which the park remains open to the public.