What does tlaa mean in Athabaskan?

"Tlaa" is not a word in Athabaskan languages. Athabaskan is a language family, not a single language. To understand what a word means in Athabaskan, you need to specify which Athabaskan language you are interested in.

For example, "Tlaa" could potentially be a word in:

* Navajo (Diné bizaad): Navajo is one of the largest Athabaskan languages.

* Apache: There are several Apache languages, including Western Apache, Mescalero Apache, etc.

* Carrier: This is an Athabaskan language spoken in Canada.

Could you please clarify which Athabaskan language you are referring to?