Definition of jumbo adjective from the Oxford Advanced Learner's Dictionary

 

jumbo

 adjective
adjective
BrE BrE//ˈdʒʌmbəʊ//
 
; NAmE NAmE//ˈdʒʌmboʊ//
 
 
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[only before noun] (informal) very large; larger than usual a jumbo pack of cornflakes Word Origin early 19th cent. (originally of a person): probably the second element of mumbo-jumbo. Originally denoting a large and clumsy person, the term became popular as the name of an elephant at London Zoo, which was sold in 1882 to the Barnum and Bailey circus.
See the Oxford Advanced American Dictionary entry: jumbo

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