ABD Definition
ābē-dē
noun
A candidate for a doctorate who has completed all the requirements for the degree, such as courses and examinations, with the exception of the dissertation.
American Heritage
abbreviation
All but dissertation.
Webster's New World
Wiktionary
(academics) All but dissertation: A description of the status of a doctoral student who has completed all PhD degree requirements except the doctoral dissertation.
Wiktionary
Origin of ABD
a(ll) b(ut) d(issertation)
From American Heritage Dictionary of the English Language, 5th Edition