定説

1. Origins, structure, and basic meaning

• Structure: 定説, read ていせつ, means a theory or view that has become widely accepted.
• Basic usage: It is used for a long-accepted theory or a view overturned by a new discovery.
  • その説は長い間、定説として受け入れられてきた。

2. Common pitfalls and similar expressions

• Acceptance and certainty
  • 定説 describes the status of being widely accepted, so it can still be overturned by new evidence.