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

 

blazer

 noun
noun
BrE BrE//ˈbleɪzə(r)//
 
; NAmE NAmE//ˈbleɪzər//
 
School life
 
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a jacket, not worn with matching trousers/pants, often showing the colours or badge of a club, school, team, etc. He was smartly dressed in a blazer and slacks. a school blazer See related entries: School life Word Origin late 19th cent.: from blaze ‘burn brightly’ + -er. The original general sense was ‘a thing that blazes or shines’ (mid 17th cent.), giving rise to the term for a brightly coloured sporting jacket.
See the Oxford Advanced American Dictionary entry: blazer