'grad' definitions:

Definition of 'grad'

noun

One-hundredth of a right angle [syn: grad, grade]

noun

A person who has received a degree from a school (high school or college or university) [syn: alumnus, alumna, alum, graduate, grad]

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]