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English definition of “root”

root

noun [C] (CAUSE/ORIGIN)    /ruːt/
C1 the cause or origin of something bad: We must get to the root of (= discover the cause of) this problem. What is/lies at the root of the problem is their lack of interest. The high crime rate has its roots in unemployment and poverty. So what's the root cause of his anxiety?Origins and sources roots B2 [plural] origins: The city of Tours can trace its roots back to Roman times. → See also grassroots adjectiveOrigins and sources
(Definition of root noun (CAUSE/ORIGIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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