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unison 
1 If two or more people do something in unison, they do it together at the same time. 
in unison  phrase 
The students gave him a rapturous welcome, chanting in unison: `We want the king!'...  
2 If people or organizations act in unison, they act the same way because they agree with each other or because they want to achieve the same aims. 
in unison  phrase 
The international community is ready to work in unison against him.