母系，是指“血统属于母亲方面的”。母系社会又称母系氏族制社会。氏族社会的早、中期为母系氏族，即建立在母系血缘关系上的社会组织，是按母系计算世系血统和继承财产的氏族制度，是氏族社会的第一阶段。
这些动物按母系群体生活。
尽管一些氏族合并成更大的氏族，而另一些氏族则分裂成更小的氏族，但母系氏族制度在这一整个时期一直保持着。
The system of matrilineal clans was maintained throughout this period, even though some clans merged to form larger groups while others divided into smaller descent groups.
原始印欧语是一门经过重构得出的语言，也就是说，这就是语言学家总结出梵语、拉丁语和希腊语的母系语言的样子。
Proto-Indo-European is a reconstructed language, meaning, it is what linguists concluded a parent language of Sanskrit, Latin and Greek would have to be like.
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