C-level - definition and synonyms

adjective [usually before a noun] business informal 

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/ˈsiː ˌlev(ə)l/
  1. referring or relating to the executive level of a company

    Even highly educated C-level executives want to get their information in plain English.

    C-level managers

Word story
From the fact that the titles of senior executives usually start with the letter C for 'chief', for example Chief Financial Officer.