n.[U]

1. 和谐，一致
   My feelings are in unison with yours.

   我的感情与你的感情是一致的。

2. 【音】同度，同音；齐唱，齐奏
   They answered in unison.

   他们齐声回答。

n.

1. simultaneous action or utterance.
2. Music  a coincidence in pitch of sounds or notes.

adj.