Definition of corollary noun from the Oxford Advanced Learner's Dictionary

 

corollary

 noun
noun
BrE BrE//kəˈrɒləri//
 
; NAmE NAmE//ˈkɔːrəleri//
 
, NAmE//ˈkɑːrəleri//
 
(pl. corollaries)
 
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corollary (of/to something) (formal or specialist) a situation, an argument or a fact that is the natural and direct result of another one In rural areas, the corollary of increased car ownership has been a rapid decline in the provision of public transport. Word Origin late Middle English: from Latin corollarium ‘money paid for a garland or chaplet; gratuity’ (in late Latin ‘deduction’), from corolla, diminutive of corona ‘wreath, crown, chaplet’.
See the Oxford Advanced American Dictionary entry: corollary