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de-(word root) not, down
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.
prefix forming verbs and verbal derivatives
1. removal of or from something specified: deforest; dethrone.
2. reversal of something: decode; decompose; desegregate.
3. departure from: decamp.
[from Latin, from dē (prep) from, away from, out of, etc. In compound words of Latin origin, de- also means away, away from (decease); down (degrade); reversal (detect); removal (defoliate); and is used intensively (devote) and pejoratively (detest)]
a prefix, occurring orig. in loanwords from Latin, used to form verbs that denote motion or conveyance down from, away, or off (deflect; descend); reversal or undoing of the effects of an action (deflate); extraction or removal of a thing (decaffeinate); thoroughness or completeness of an action (despoil).
[Middle English < Latin dē-, prefixal use of dē (preposition) from, away from, of, out of; in some words, < French < Latin dē- or dis- dis-1]
2. destroyer escort.
1. Doctor of Engineering.
2. driver education.