noun
commercial practice; business custom
Refers to established ways of doing business, trade customs, or commercial usages.
国際商慣習に従って契約を結ぶ。
We conclude the contract in accordance with international commercial practices.
Often used interchangeably, but 商慣習 can sound slightly more formal or legal.
Compound of 商 (commerce) and 慣習 (custom, practice).