equal · together

1. Origins, structure, and basic meaning

• Structure: 斉 has 8 strokes; 一斉 is read いっせい, and 斉唱 is read せいしょう.
• Basic usage: 一斉 describes several people or things acting at once; 斉唱 denotes singing together in unison.

2. Common pitfalls and similar expressions

• Simultaneous action and singing together
  • 一斉に走り出した describes several athletes starting to run at the same time. The reading of 一斉 contains a small っ, and に makes it describe how an action occurs.
  • 校歌を斉唱した means singing the school song together. 一斉 can also describe running or flowers blooming, while 斉唱 focuses on the act of singing together.