'Del' definitions:

Definition of 'Del'

From: GCIDE
  • Del \Del\, n. [See Deal, n.] Share; portion; part. [Obs.] --Chaucer. [1913 Webster]

Definition of 'del'

From: 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]