Webster's English Dictionary

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irrevocable

ir.re.vo.ca.ble \(')ir-'(r)ev-*-k*-b*l also .ir-i-.vo--k*-\ \-ble-\ aj [ME, 
   fr. L irrevocabilis, fr. in- + revocabilis revocable] : incapable of being 
   revoked : UNALTERABLE  - ir.re.vo.ca.ble.ness n