De is defined as meaning "of" in Spanish, French and Portuguese.(preposition)
An example of de is of the water.
See de in Webster's New World College Dictionary
Origin: Fr < L de: see de-
Origin: L, a prefix signifying separation, cessation, intensification, or contraction; also < Fr dé- (< L de) or OFr des- (< L dis-): see dis-
See de in American Heritage Dictionary 4
Origin: Middle English de-
Origin: , from Old French de- (from Latin dē-, from, off, apart, away, down, out, completely, from dē; see de- in Indo-European roots)
Origin: or from Old French des-, out, off, apart, away, completely (from Latin dis-, dis-, and Latin dē-).
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