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English definition of “missing link”

missing link

noun [S]    
something that is necessary to complete a series or solve a problem: Those documents provided the missing link, and the police were able to make an arrest soon after they discovered them.Proving and disproving the missing link an animal that no longer exists or might never have existed and is thought to explain how humans developed from apesPalaeontology and fossils
(Definition of missing link noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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