許可

1. Origins, structure, and basic meaning

• Structure: 許可 is read as きょか. It is a noun, also used with する, for official permission to perform an otherwise restricted action.
• Basic usage: Use 許可を得る from the recipient’s viewpoint and 許可なく for acting without permission.

2. Common pitfalls and similar expressions

• Viewpoint and particles
  • 許可を得る means to obtain permission, whereas 許可する presents the act of granting it.
• Form of 許可なく
  • 許可なく入る means to enter without permission; なく here attaches to the noun phrase rather than forming the negative of a verb.