1. Do or make the opposite of; reverse: decriminalize.
2. Remove or remove from: delouse; deoxygenate.
3. Out of: deplane; defenestration.
4. Reduce; degrade: declass.
5. Derived from: deverbative.
[Middle English de-, from Old French de- (from Latin dē-, from, off, apart, away, down, out, completely, from dē; see de- in the Appendix of Indo-European roots) or from Old French des-, out, off, apart, away, completely (from Latin dis-, dis-, and Latin dē-).]
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