niece

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niece [noun]

a daughter of your brother or sister, or a daughter of your husband's or wife's brother or sister

US /niːs/ 
UK /niːs/ 
Example: 

If he's my uncle, then I'm his niece.

Oxford Essential Dictionary

niece

 noun
the daughter of your brother or sister Look at nephew.

Longman Dictionary of Contemporary English

niece

niece /niːs/ BrE AmE noun [countable]
[Date: 1200-1300; Language: Old French; Origin: Late Latin neptia 'granddaughter, niece']
the daughter of your brother or sister, or the daughter of your wife’s or husband’s brother or sister ⇨ nephew, aunt, uncle

Oxford Advanced Learner's Dictionary

niece

niece [niece nieces]   [niːs]    [niːs]  noun
the daughter of your brother or sister; the daughter of your husband's or wife's brother or sister
compare  nephew  
Word Origin:

Middle English: from Old French, based on Latin neptis ‘granddaughter’, feminine of nepos ‘nephew, grandson’, from an Indo-European root shared by Dutch nicht, German Nichte.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

niece / niːs / noun [ C ]

B1 a daughter of your brother or sister, or a daughter of your husband's or wife's brother or sister

→  Compare nephew

Collins Advanced Learner’s English Dictionary

niece

[ni͟ːs]
 nieces
 N-COUNT: oft poss N
 Someone's niece is the daughter of their sister or brother.
  ...his niece from America, the daughter of his eldest sister.

Merriam-Webster's Advanced Learner's Dictionary

niece

niece /ˈniːs/ noun, pl niec·es [count] : a daughter of your brother or sister
• If he's my uncle, then I'm his niece.
- compare nephew