一定

1. Origins, structure, and basic meaning

• Structure: 一定 is read as いってい and means “constant” and “specified”.
• Basic usage: It describes keeping temperature constant and meeting a specified set of conditions.

2. Common pitfalls and similar expressions

• 一定に保つ / 一定の条件
  • 一定に保つ means keeping a value constant, while 一定の条件 means specified criteria.