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

Origin of stepsister

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

Examples from the Web for stepsister

Contemporary Examples of stepsister

  • A stepsister riding in the car with him during a trip home to Massachusetts also perished.

    The Daily Beast logo
    Is This Caylee's Daddy?

    Diane Dimond

    June 29, 2011

Historical Examples of stepsister

  • She was the only relation I had, except my stepsister, and she was off travelling.

    The Prisoner

    Alice Brown

  • She was surprised and almost alarmed at the effect upon her stepsister.

    A True Friend

    Adeline Sergeant

  • "I'm afraid I was looking at the horses," cut in her stepsister.

  • Yet I think she would have stayed if her stepsister had not urged.

  • But while she was doing so her stepsister gave her a push, and she fell backward into the water.

British Dictionary definitions for stepsister



a daughter 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