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[ˈædvəkəsi]

n. 拥护,鼓吹,辩护

拆分: ad-朝,向,接近 + -voc-叫喊 + -acy名词词尾 ⇒ 被喊过去帮助辩论 

习惯用语:  
speak in advocacy of ...辩护演说  

例:
He is insistent on the advocacy of new scientific methods. 他坚持提倡新的科学方法。 
She is renowned for her advocacy of human rights. 她以提倡人权而闻名。