Definition of in medias res adverb from the Oxford Advanced Learner's Dictionary

 

in medias res

 adverb
adverb
BrE BrE//ɪn ˌmiːdiæs ˈreɪz//
 
; NAmE NAmE//ɪn ˌmiːdiæs ˈreɪz//
 
(formal, from Latin)
 
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straight into the main part of a story or account without giving any introduction He began his story in medias res. Word OriginLatin.
See the Oxford Advanced American Dictionary entry: in medias res