Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A son of one's stepparent.

from The Century Dictionary.

  • noun One's stepfather's or stepmother's son by a former marriage.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A brother by the marriage of one's father with the mother of another, or of one's mother with the father of another.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The son of one's stepfather or stepmother who is not the son of one's mother and is not the son of one's father.
  • noun The stepson of one's father or mother which is not one's half-brother.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a brother who has only one parent in common with you

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

step- +‎ brother

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