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

 

stepsister

 noun
noun
BrE BrE//ˈstepsɪstə(r)//
 
; NAmE NAmE//ˈstepsɪstər//
 
Relations
 
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the daughter from an earlier marriage of your stepmother or stepfather compare half-sister See related entries: Relations
See the Oxford Advanced American Dictionary entry: stepsister