制限

1. Origins, structure, and basic meaning

• Structure: 制限 is read as せいげん and is a noun and する verb for setting a limit or restriction on numbers, weight, actions, or another scope.
• Basic usage: A limit on attendance appears in 入場人数に制限がある, while restricting luggage weight appears in 荷物の重さを制限する.

2. Common pitfalls and similar expressions

• Existence and action
  • Use 制限がある for an existing limit and 制限する for the act of restricting a scope.
• Difference from 禁止
  • It narrows what is permitted and differs from a prohibition that disallows the act entirely.