Entry 1 sense Webster, 1913 Orchestral /ôr-kĕs'-trəl/ · Or·ches·tral · IPA /ˌɔɹˈkɛstɹəl/ 01 a. Of or pertaining to an orchestra; suitable for, or performed in or by, an orchestra. 1. Of or pertaining to an orchestra; suitable for, or performed in or by, an orchestra.