等級

1. Origins, structure, and basic meaning

• Structure: 等級 is read as とうきゅう and is a noun for a grade or class assigned according to standards of quality, performance, or qualification.
• Basic usage: A basis for price differences appears in 品質の等級, while classification after inspection appears in 上の等級に分類する.

2. Common pitfalls and similar expressions

• Levels based on standards
  • It classifies comparable items into levels according to inspection or quality criteria rather than merely placing them in order.
• Difference from 順位
  • 順位 is an ordering such as first or second in a competition, whereas 等級 is a quality or qualification level meeting defined standards.