English

Definition of primary source noun from the Oxford Advanced Learner's Dictionary

 

primary source

 noun
noun
BrE BrE//ˈpraɪməri sɔːs//
 
; NAmE NAmE//ˈpraɪmeri sɔːrs//
 
 
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a document, etc. that contains information obtained by research or observation, not taken from other books, etc. compare secondary source
See the Oxford Advanced American Dictionary entry: primary source