[[t]tjuːmʌ̱ltʃuəs, AM tuː-[/t]]
1) ADJ-GRADED: usu ADJ n A tumultuous event or period of time involves many exciting and confusing events or feelings.

...the tumultuous changes in Eastern Europe...

It's been a tumultuous day at the international trade negotiations in Brussels.

2) ADJ: usu ADJ n A tumultuous reaction to something is very noisy, because the people involved are very happy or excited.

A tumultuous welcome from a 2,000 strong crowd greeted the champion...

Delegates greeted the news with tumultuous applause.

English dictionary. 2008.