Abbreviation of オーケストラ, used in casual contexts such as band names, event titles, and everyday conversation.
See also: オーケストラ
I joined the orchestra right after starting university.
I'm going to an orchestra concert with a friend next week.
This band sings with a live orchestra backing.
We gathered volunteers and put together an amateur orchestra.
We have orchestra practice every Saturday.
amateur orchestra
Clipped form of オーケストラ, from English 'orchestra'.