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Etymology

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Blend of alternative +‎ language. By surface analysis, alt +‎ -lang.

Pronunciation

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Noun

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altlang (plural altlangs)

  1. (linguistics, conlanging) A constructed language created as an alternate history of a real language.
    • 2003 January 29, James Landau <neurotico@aol.com>, “Re: Fickleness”, in Conlang mailing list[1], via listserv.brown.edu:
      Make a con-script, if your language would have it. (If your language is simply a Romance altlang that stays reasonably close to the original locations, it probably wouldn't use any alphabet other than the Roman.)