a daughter of one's husband or wife by a previous marriage.

before 900; Middle English stepdohter, Old English stēopdohtor. See step-, daughter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stepdaughter (ˈstɛpˌdɔːtə)
a daughter of one's husband or wife by a former union

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Then, in the latter case, you would perhaps resign yourself to not being
  pleased-to simply seeing your stepdaughter married.
She had gone to pick up her stepdaughter from preschool, and was inspired by
  what was going on in the school room.
The teaser shows an inevitable rift growing with an angry stepdaughter.
Now he has, in addition to a stepdaughter, two sons of his own.
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