noun
fixed rule; established rule
Refers to a rule or regulation that is set and not easily changed; often used in formal or legal contexts.
この会社には定法に従って手続きを進める必要がある。
In this company, we must proceed according to the fixed rules.
noun
usual way; customary method
Describes a habitual or conventional way of doing something; less rigid than a formal rule.
彼は定法通りに朝の散歩を欠かさない。
He never misses his morning walk, as is his usual way.
Compound of 定 (fixed, established) and 法 (law, method). The alternate spelling 常法 uses 常 (usual, ordinary) to emphasize habitual or customary aspects.