The Nahuan or Aztecan languages are those languages of the Uto-Aztecan language family that have undergone the sound change known as Whorf's Law changing the original /*t/ to before */a/. Subsequently some Nahuan languages have changed /tl/ back to /t/ or to /l/, but it can still be seen that the language went through a -tl stage.
The Nahuan are the extinct Pochutec language and the various Nahuatl dialects, including Pipil.
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“Science and technology multiply around us. To an increasing extent they dictate the languages in which we speak and think. Either we use those languages, or we remain mute.”
—J.G. (James Graham)