Ontarian Definition
    adjective
  
 Of or pertaining to the Canadian province of Ontario.
Wiktionary 
    noun
  
 A native or inhabitant of Ontario, Canada.
 Wiktionary 
Other Word Forms of Ontarian
Noun
Singular:
 ontarianPlural:
 ontariansOrigin of Ontarian
-  From Ontario + -an. From Wiktionary 
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