The mother tongue is Macedonian, a south Slavic language.

母语是马其顿语，一种南斯拉夫人的语言。

youdao

Tonight the BBC has confirmed that it will close the Albanian, Macedonian and Serbian language services as well as Portuguese for Africa and the English for Caribbean service.

今晚，英国广播公司证实，将关闭阿尔巴尼亚，马其顿和塞尔维亚以及非洲的葡萄牙语频道和针对加勒比地区的英语频道。

youdao

But for right now, all you need to know is that all of these generals, although they were Macedonians and spoke Macedonian and not themselves Greek, but they had, just like Alexander, they had adopted Greek language, Greek culture.

不过目前，你们只要知道所有四位将领，虽然都是马其顿人，说马其顿语,不是希腊人，但是他们和亚历山大一样，使用希腊语，希腊文化。

耶鲁公开课 - 新约课程节选

To put the question differently: if the native language of the Macedonians is Greek, what is its Macedonian dialect?

FORBES: Two Great Historians On Alexander the Great Part 2