1.  grad(n = noun.quantity) grade - one-hundredth of a right angle; Array
is a kind of angular unit
is a part of right angle

2.  grad(n = noun.person) alum, alumna, alumnus, graduate - a person who has received a degree from a school (high school or college or university); Array
is a kind of bookman, scholar, scholarly person, student
has particulars: ivy leaguer, old boy

grad, n. colloq. = GRADUATE n. 1.

Etymology:
abbr.

grad school, grad student