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

 

medieval

 adjective
(also mediaeval)adjective
BrE BrE//ˌmediˈiːvl//
 
; NAmE NAmE//ˌmediˈiːvl//
 
, also NAmE//ˌmiːdˈiːvl//
 
[usually before noun]
 
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connected with the Middle Ages (about AD 1000 to AD 1450) medieval architecture/castles/manuscripts the literature of the late medieval period Word Origin early 19th cent.: from modern Latin medium aevum ‘middle age’ + -al.
See the Oxford Advanced American Dictionary entry: medieval