From The Collaborative International Dictionary of English v.0.44 [gcide]:
De- \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.
From WordNet (r) 2.0 [wn]:
noun
1: a Mid-Atlantic state; one of the original 13 colonies [syn: {Delaware}, {Diamond State}, {First State}]
From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:
de The {country code} for Germany. (1999-01-27)
From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]: