一律

1. Origins, structure, and basic meaning

• Structure: 一律 (いちりつ) is a nominal adverb for applying one uniform rule or amount without individual differentiation.
• Basic usage: 全員を一律に扱う questions uniform treatment that ignores circumstances, while 参加費は一律千円だ predicates one fee regardless of age.

2. Common pitfalls and similar expressions

• Uniform treatment and flat fee
  • 一律に扱う describes a method of treatment, whereas 一律千円 sets an applied amount. Uniformity does not automatically guarantee fairness or erase every difference.