Definitions from Wiktionary ( )

▸ noun:  (mathematical analysis) The symbol ∇ used to denote the gradient operator.
▸ noun:  (mathematics) the symbol ∂, in the context of a partial differential
▸ noun:  (obsolete) a part, portion
▸ noun:  (British) A diminutive of the male given name Derek.
▸ noun:  Abbreviation of delegate. [A person authorized to act as representative for another; a deputy.]
▸ noun:  Abbreviation of delegation. [An act of delegating.]
▸ verb:  Abbreviation of delete. [(transitive) To remove, get rid of or erase, especially written or printed material, or data on a computer or other device.]
▸ verb:  abbreviation of delineavit as seen on published artwork, identifying the original artist. Commonly seen in books and articles on topics in natural history
▸ noun:  Abbreviation of Delaware. [A river in the northeastern United States, running from the Catskills into the Atlantic Ocean at Delaware Bay.]
▸ noun:  (India) Abbreviation of Delhi. [A megacity and union territory of India, containing the national capital New Delhi.]
▸ noun:  (astronomy) Abbreviation of Delphinus. [(astronomy) A small summer constellation of the northern sky, said to resemble a dolphin. It lies between the constellations Cygnus and Aquila.]
▸ noun:  Abbreviation of Delete (“key of a computer keyboard that deletes text, files, etc.”). [(computing) A key that may be pressed to delete something (such as text or files) from a computer. The key also erases text from left to right, unlike the backspace key.]

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