Whether or not it is due to genetic unity

Whether or not it is due to genetic unity, typologically the Australian languages form a language area or Sprachbund, sharing much of their vocabulary and sharing many distinctive phonological features across the entire continent.

A common feature of many Australian languages is that they display so-called mother-in-law languages, special speech registers used only in the presence of certain close relatives. These registers share the phonology and grammar of the standard language, but the lexicon is different and usually very restricted. There are also commonly speech taboos during extended periods of mourning or initiation that have led to a large number of Aboriginal sign languages.

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