Octet/ɑːkˈtet/ Definition 1 of 3Pro Tip 1/3Group Composition Refers to a complete set or group containing exactly eight members. The octet of experts collaborated to solve the challenge. Pro Tip 2/3Collective Performance Often used in performance arts to highlight the number of performers. An octet of singers harmonized beautifully during the concert. Pro Tip 3/3Visual Impact In visual contexts, an octet arrangement adds symmetry and balance. The gallery showcased an octet of paintings from the artist.