accidental

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accidental

/ac·ci·den·tal/ (ak″sĭ-den´t'l)
1. occurring by chance, unexpectedly, or unintentionally.
2. nonessential; not innate or intrinsic.

accidental

adjective Unexpected; by chance

accident

(ak'si-dent) [L. accidere, to happen]
1. An unforeseen, unfortunate occurrence.
2. An unexpected complication of a disease or treatment.. accidental (-den'tal), adjective; accidentally

cerebrovascular accident

Abbreviation: CVA
Stroke.

radiation accident

Undesired excessive exposure to ionizing radiation.