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

Origin of stepbrother

late Middle English word dating back to 1400–50; see origin at step-, brother Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for stepbrother

Contemporary Examples of stepbrother

Historical Examples of stepbrother

British Dictionary definitions for stepbrother



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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for stepbrother

mid-15c., from step- + brother (n.).

Online Etymology Dictionary, © 2010 Douglas Harper