Identity of pitch between two notes

• Simultaneous playing or singing at the same pitch or in octaves
• A passage performed in unison

两个音的同音高

• 以相同音高或八度同时演奏或演唱
• 以齐奏或齐唱的乐段

Complete agreement or harmony

• Several people speaking or acting at the same time
• Speaking the same words together

完全一致或协调的状态

• 多人同时说话或行动
• 齐声说出相同的话