DE Definition
Origin of DE
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Middle English de- from Old French de- (from Latin dē- from, off, apart, away, down, out, completely) (from dē de- in Indo-European roots) or from Old French des- out, off, apart, away, completely (from Latin dis- dis-) (and Latin dē-)
From American Heritage Dictionary of the English Language, 5th Edition
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L, a prefix signifying separation, cessation, intensification, or contraction; also < Fr dé- (< L de) or OFr des- (< L dis-): see dis-
From Webster's New World College Dictionary, 5th Edition