[re.per.cus.sion] n [L repercussion-, repercussio, fr. repercutere to drive back, fr. re- + percutere to beat--more at percussion] (1536) 1: reflection, reverberation
2. a: an action or effect given or exerted in return: a reciprocal action or effect b: a widespread, indirect, or unforeseen effect of an act, action, or event--usu. used in pl. -- re.per.cus.sive adj