nephew

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nephew [noun]

a son of your sister or brother, or a son of the sister or brother of your husband or wife

US /ˈnef.juː/ 
UK /ˈnef.juː/ 
Example: 

I am planning a 25th birthday party for my nephew.

 

Oxford Essential Dictionary

nephew

 noun
the son of your brother or sister

Longman Dictionary of Contemporary English

nephew

nephew /ˈnefjuː, ˈnev- $ ˈnef-/ BrE AmE noun [countable]
[Date: 1200-1300; Language: Old French; Origin: neveu, from Latin nepos 'grandson, nephew']
the son of your brother or sister, or the son of your husband’s or wife’s brother or sister ⇨ niece, uncle, aunt
 

Oxford Advanced Learner's Dictionary

nephew

nephew [nephew nephews]   [ˈnefjuː]    [ˈnefjuː]    [ˈnevjuː]    [ˈnevjuː]  noun
the son of your brother or sister; the son of your husband's or wife's brother or sister
compare  niece  
Word Origin:

Middle English: from Old French neveu, from Latin nepos ‘grandson, nephew’, from an Indo-European root shared by Dutch neef and German Neffe.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition
 

nephew / ˈnef.juː / / ˈnev- / noun [ C ]

B1 a son of your sister or brother, or a son of the sister or brother of your husband or wife

→  Compare niece

Collins Advanced Learner’s English Dictionary

nephew

[ne̱fjuː, ne̱v-]
 nephews
 N-COUNT: oft poss N
 Someone's nephew is the son of their sister or brother.
  I am planning a 25th birthday party for my nephew.

Merriam-Webster's Advanced Learner's Dictionary

nephew

neph·ew /ˈnɛfju/ noun, pl -ews [count] : a son of your brother or sister - compare niece