CEDICT
cousin (mother's sibling's or father's sister's son older than oneself)
Wiktionary
称谓。用以称姑母、舅父、姨母的儿子,且年纪比自己长者。
重編國語辭典
父亲的姐妹的儿子或母亲的兄弟姐妹的儿子,年龄大于自己
維基詞典
She was envious of her cousin's success.
Source: Tatoeba