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

 

stepfather

 noun
noun
BrE BrE//ˈstepfɑːðə(r)//
 
; NAmE NAmE//ˈstepfɑːðər//
 
Marriage, Relations
 
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the man who is married to your mother but who is not your real father He lives at home with his mother and stepfather. See related entries: Marriage, Relations Word Origin Old English stēopfæder (see step-, father).
See the Oxford Advanced American Dictionary entry: stepfather