Longman Dictionary of Contemporary English homepage

master

3 adjective
     
master3 [only before noun]
1 a master copy of a document, recording etc is the one from which copies are made
master list/copy/recording etc
We've lost the master disk.
2 most important or main:
the master control center at NASA
3

master craftsman/chef/plumber etc

someone who is very skilled at a particular job, especially a job that involves working with your hands:
a society of master chefs

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