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

 

stickler

 noun
noun
BrE BrE//ˈstɪklə(r)//
 
; NAmE NAmE//ˈstɪklər//
 
 
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stickler (for something) a person who thinks that a particular quality or type of behaviour is very important and expects other people to think and behave in the same way a stickler for punctuality Word Origin mid 16th cent. (in the sense ‘umpire’): from obsolete stickle ‘be umpire’, alteration of obsolete stightle ‘to control’, frequentative of Old English stiht(i)an ‘set in order’.
See the Oxford Advanced American Dictionary entry: stickler