Going toward; impinging upon, as i. rays. [L. incido, pp. -casus, to fall into, to meet with]
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in·ci·dent 'in(t)-səd-ənt, -sə-.dent adj falling or striking on something <\incident light rays> <\incident radiation>
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in·ci·dent (inґsĭ-dənt) [L. incidere to fall upon] 1. an unusual or noteworthy occurrence. 2. falling or striking upon, as incident radiation.Medical dictionary. 2011.