The difference between Aunt and Niece
When used as nouns, aunt means the sister or sister-in-law of one's parent, whereas niece means a daughter of one's sibling, brother-in-law, or sister-in-law.
check bellow for the other definitions of Aunt and Niece
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Aunt as a noun:
The sister or sister-in-law of one's parent.
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Aunt as a noun (affectionate):
A woman of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.
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Aunt as a noun (obsolete):
Any elderly woman.
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Aunt as a noun (obsolete):
A procuress or bawd.
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Niece as a noun:
A daughter of one's sibling, brother-in-law, or sister-in-law; either the daughter of one's brother ("fraternal niece"), or of one's sister ("sororal niece").
Examples:
"My niece just celebrated her 15th birthday."