noun
internal rules; bylaws; private regulations
Refers to rules or regulations established within an organization, company, or group, as opposed to public laws. The gloss 'tradition' is a rare, extended use for unwritten internal norms.
会社の内規に従って、残業代が支払われる。
Overtime pay is provided according to the company's internal rules.
このクラブには、会員だけが知る内規がある。
This club has internal rules known only to its members.
Compound of 内 (internal) and 規 (rule, regulation). The term is straightforward and modern, with no obscure historical derivation.