defined style; official style; rule
Refers to a predetermined or officially established format, style, or rule, often in formal, organizational, or technical contexts.
この書類は制式に従って作成してください。
Please prepare this document according to the official style.
制式の変更は来月から適用されます。
The change in the defined style will take effect from next month.
Compound of 制 (regulation, system) and 式 (style, form). The exact historical derivation is uncertain, but the combination naturally yields the meaning of a regulated or prescribed style.