Definition of in medias res in English:

in medias res

adverb

  • 1Into the middle of a narrative; without preamble.

    ‘having begun his story in medias res’
    • ‘The film is great at conveying an aura of homoerotic decadence, but it loses quite a bit by beginning the story in medias res.’
    • ‘We enter the story in medias res, joining on-set a company that has been laboring on that film for a year.’
    1. 1.1 Into the midst of things.

Origin

Latin.

Pronunciation

in medias res

/ɪn ˌmiːdɪas ˈreɪz/