one's stepfather's son or stepmother's son by a previous marriage.

1400–50; late Middle English; see step-, brother Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stepbrother (ˈstɛpˌbrʌðə)
a son of one's stepmother or stepfather by a union with someone other than one's father or mother respectively

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Sometimes on the weekends, my older stepbrother and stepsister live with us, too.
The stepfather, stepmother, stepbrother or stepsister.
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