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Adjective: improvisatory  ,im-pru'vI-zu,to-ree or im'pró-vu-su,to-ree [N. Amer], ,im-pru'vI-zu-t(u-)ree or ,im-pru-vI'zey-tu-ree [Brit]
  1. Of, pertaining to, or characterized by improvisation or extemporaneous composition
    "The jazz musician's improvisatory style captivated the audience"