1 definition found From The Collaborative International Dictionary of English v.0.48 [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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