As a Noun: 1. A large group of musicians who play a variety of different instruments together, usually playing classical music. English = orchestra. 2. A person who stands in front of an orchestra or choir and direct its performance. English = conductor. 3. A group of musicians, especially who play brass or percussion instruments. English = band. As a Verb or Adjective: 1. To direct the performance of an orchestra or choir. English = conduct.