一条

1. Origins, structure, and basic meaning

• Structure: 一条 is read as いちじょう and is a noun and counting expression for one ray or for one clause in a rule or legal text.
• Basic usage: A single ray appears in 一条の光, while selecting one clause appears in 規則から一条を選ぶ.

2. Common pitfalls and similar expressions

• Two context-dependent senses
  • It can count something extending in a narrow line, such as light, or identify one item among multiple clauses.
• Difference from 一項
  • Both can count units in rules, but the comparison term can refer to a subordinate paragraph or item within an article.