An aunt — a sister (older or younger) of one’s parent. Commonly read as 'おば'; 伯母 can indicate an aunt older than your parent and 叔母 one younger (though both are often written as おば).
私の叔母は大学で英語を教えている。
My aunt teaches English at a university.
伯母は母より年上だが、とても若く見える。
My aunt (older than my mother) is older than my mother but looks very young.
子どものころ、よくおばの家に遊びに行った。
When I was a child, I often went to play at my aunt's house.