The difference between Maternal uncle and Paternal aunt
When used as nouns, maternal uncle means the brother or brother-in-law of one's mother, whereas paternal aunt means the sister or sister-in-law of one's father.
check bellow for the other definitions of Maternal uncle and Paternal aunt
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Maternal uncle as a noun:
The brother or brother-in-law of one's mother.
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Paternal aunt as a noun:
the sister or sister-in-law of one's father