回転

1. Origins, structure, and basic meaning

• Structure: 回転 is read かいてん and means turning around an axis or center.
• Basic usage: It describes a gear turning or an athlete rotating in the air.

2. Common pitfalls and similar expressions

• Rotating and making it turn
  • 歯車が回転する describes the gear's rotating movement.
  • 歯車を回す describes someone turning the gear.
• What is counted
  • 二回転 means two rotations, not necessarily two attempts. A single attempt can include two rotations.