avocation [ˌævəʊˈkeɪʃn]

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n.副业，业余爱好

an auxiliary activity

He was a printer by trade and naturalist by avocation. 他从事印刷业，同时是个博物学爱好者。
Learning foreign languages is just an avocation with me. 学习外语只不过是我的一项业余爱好。