Real Dictionary

D.E. in American English
abbreviation: Doctor of Engineering

DE in American English
defensive end
of or from
abbreviation: Delaware (approved esp. for use with zip code)
preposition: from; of (used in French, Spanish, and Portuguese personal names, originally to indicate place of origin)

DE in British English
abbreviation for: (formerly in Britain) Department of Employment

de in British English 1
of; from: occurring as part of some personal names and originally indicating place of origin

de in British English 2
the internet domain name for: Germany

de-
prefix: De- is added to a verb in order to change the meaning of the verb to its opposite.

de- in American English
away from, off
prefix: a prefix occurring in loanwords from Latin (decide); also used to indicate privation, removal, and separation (dehumidify), negation ( demerit; derange), descent ( degrade; deduce), reversal (detract), or intensity (decompound)

de- in British English
prefix forming verbs and verbal derivatives: removal of or from something specified

de' in American English
preposition: dei (used in Italian names as an elided form of dei)