In the last few weeks I have learned the meaning of the term "All but dissertation". the following is from Wikipedia:
The term all but dissertation (ABD) is a mostly unofficial term identifying a stage in the process of obtaining a Doctor of Philosophy (Ph.D.) degree or equivalent research doctorate (Ed.D., EngD, Sc.D., etc) in the United States and Canada. At this stage the student has completed the preparatory coursework, qualifying examinations, comprehensive examinations, and defended his or her dissertation proposal. To complete the degree, the student must carry out the proposed research which must be original research and write the dissertation that defines a Ph.D. or equivalent research doctorate.
Congratulations Son !