Altaic sprachbund

The Altaic sprachbund is a grouping of five separate language families that share a number of common features, including shared vocabulary and grammatical points. The language families covered are:

It was once believed that these languages belonged to a larger Altaic family, but since the 1960s the majority of linguists have rejected that theory, deeming the similarities to be due to centuries of close contact rather than a common ancestor. See Debunking of the Altaic family for more on that.