As I understand, [梁启超](https://zh.wikipedia.org/wiki/%E6%A2%81%E5%90%AF%E8%B6%85) (Liáng Qǐchāo) is a famous Chinese patriot, who opposed imperialism and European influence prior to and during World War I. My teacher mentioned a quote from him (少年强则中国强), so I looked it up and found this:

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> 少年强则国强，少年智则国智，少年富则国富，少年独立则国独立，少年自由则国自由，少年进步则国进步，少年胜于欧洲，则国胜于欧洲，少年**雄于**地球，则国**雄于**地球。  
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> 梁启超 [(source)](https://baike.baidu.com/item/%E5%B0%91%E5%B9%B4%E5%BC%BA/3780413)
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Each part of this quote has a similar structure, e.g., 少年强则国强, which means something along the lines of "strong youth leads to strong country".

However, I don't understand 雄于 in this quote. I've only ever encountered 雄 previously in 英雄 ("hero"). I didn't find anything meaningful on [YouDao](http://youdao.com/w/%E9%9B%84%E4%BA%8E) or [Jukuu](http://www.jukuu.com/search.php?q=%E9%9B%84%E4%BA%8E), so I'd guess 雄于 is particular to this quote.

**Question**: What does 雄于 in 少年雄于地球，则国雄于地球 mean?