GNU Collaborative International Dictionary of English

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1.       
   De- (?). A prefix from Latin de down, from, away; as in debark, decline, decease, deduct, decamp. In words from the French it is equivalent to Latin dis- apart, away; or sometimes to de.  Cf. Dis-. It is negative and opposite in derange, deform, destroy, etc. It is intensive in deprave, despoil, declare, desolate, etc.
   
   [1913 Webster]