Webster's English Dictionary

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repercussion

re.per.cus.sion \.re--p*r-'k*sh-*n, .rep-*r-\ \-'k*s-iv\ n [L 
   repercussion-, repercussio, fr. repercussus, pp. of rep]ercutere to drive 
   back, fr. re- + percutere to beat - more at PERCUSSION 1: REFLECTION, 
   REVERBERATION  2a: a reciprocal action or effect  2b: a widespread, 
   indirect, or unforeseen effect of an act, action, or even t - 
   re.per.cus.sive aj