noun
A bank that provides services such as deposits, loans, and foreign exchange to businesses and individuals, as opposed to central banks or investment banks.
商業銀行は企業向けの融資を行っている。
Commercial banks provide loans to businesses.
Compound of 商業 (commerce) and 銀行 (bank). The term is a direct calque from English 'commercial bank' and became common in modern Japanese banking terminology.