間隔

1. Origins, structure, and basic meaning

• Structure: 間隔(かんかく) is the distance or time separating two things or points.
• Basic usage: It is used for spacing between chairs and time left between repeated actions.

2. Common pitfalls and similar expressions

• The view of time compared with 期間
  • 期間(きかん) is a period extending from a beginning to an end. 間隔 focuses on the gap between separate points, such as one occasion and the next.