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master

noun [C] (COPY)
 
 
/ˈmɑː.stər/ US  /ˈmæs.tɚ/

Definition

an original version of something from which copies can be made: I sent her a copy and kept the master. You should keep the master copy (= the original) in a safe place.Samples and examples
(Definition of master noun (COPY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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