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

 

fixity

 noun
noun
BrE BrE//ˈfɪksəti//
 
; NAmE NAmE//ˈfɪksəti//
 
[uncountable](formal)
 
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the quality of being firm and not changing He has great fixity of purpose. the fixity of exchange rates Word Origin mid 17th cent. (denoting the property of a substance of not evaporating or losing weight when heated): partly from obsolete fix ‘fixed’, partly from French fixité.
See the Oxford Advanced American Dictionary entry: fixity