master - definition and synonyms

adjective [only before noun] 

Your browser doesn’t support HTML5 audio

/ˈmɑːstə(r)/
  1. 1
    a master document, photograph, recording etc is one from which copies are made

    the master tape

  2. 2
    used with the name of a job to show that someone has a lot of experience and skill and can train other people

    His father was a master carpenter.