aunty
n.the sister of your father or mother, or the wife of your uncle. You might also use this word for a close female friend of your family.
n.the sister of one's parent or the spouse of one's uncle. Often used as a familiar or affectionate term of address, sometimes extended to close female family friends in various cultures.
“My aunty lives in London and visits us every summer.”
“I am going to stay with my favorite aunty this weekend to help her in the garden.”
Commonly used as a term of address; often capitalized when used as a title before a name.
Both 'aunty' and 'auntie' are correct, but learners should be consistent with the spelling throughout their writing.
From aunt + -y.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.