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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Del \Del\, noun [See {Deal}, noun] Share; portion; part. [Obs.] --Chaucer.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
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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