1.
establishment; opening; setting up
Creating or opening a new institution, facility, account, or service for the first time. Commonly used for offices, accounts, websites, courses, and facilities.
銀行口座を開設する。
To open a bank account.
会社のホームページを開設した。
We set up the company's website.
市は災害時の避難所として、新しい施設を開設することを決定した。
The city decided to establish a new facility to serve as an evacuation shelter in times of disaster.
USAGE:
開設 is used for creating or opening something institutional or systematic — bank accounts, websites, offices, courses, facilities. It is more formal than simply 開く and implies official establishment.
COMMON COLLOCATIONS:
- 口座を開設する (to open an account)
- ホームページを開設する (to set up a website)
- 事務所を開設する (to open an office)
- 講座を開設する (to establish a course)
- 窓口を開設する (to open a service counter)
HOMOPHONE:
解説 (explanation, commentary) shares the same reading but has a completely different meaning and kanji.