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1. The Collaborative International Dictionary of English v.0.48
Del \Del\, n. [See Deal, n.]
   Share; portion; part. [Obs.] --Chaucer.
   [1913 Webster]

2. The Collaborative International Dictionary of English v.0.48
del \del\ n. (Math.)
   a differential operator which, operating on a function of
   several variables, gives the sum of the partial derivatives
   of the function with respect to the three orthogonal spatial
   coordinates; -- also called the gradient or grad. It is
   represented by an inverted Greek capital delta ([nabla]), and
   is thus because of its shape also called nabla, meaning
   harp in Hebrew.
   [PJC]

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