Definition of doctoral adjective from the Oxford Advanced Learner's Dictionary

 

doctoral

 adjective
adjective
BrE BrE//ˈdɒktərəl//
 
; NAmE NAmE//ˈdɑːktərəl//
 
[only before noun]
 
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connected with a doctorate (British English) a doctoral thesis (North American English) a doctoral dissertation
See the Oxford Advanced American Dictionary entry: doctoral