Webster's English Dictionary

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improvisation

im.pro.vi.sa.tion \(.)im-.pra:v-*-'za--sh*n, .im-pr*-v*-\ \-shn*l, 
   -sh*n-*l\ n 1: the act or art of improvising  2: something improvised  - 
   im.pro.vi.sa.tion.al aj