A posteriori language

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An a posteriori language (from Latin a posteriori - from the latter), according to Louis Couturat, is any constructed language whose elements are borrowed or based on existing languages, as opposed to the a priori languages.

The a posteriori languages can be divided into three categories:

In distinguishing whether the language is a priori or a posteriori the prevalence and distribution of respectable traits is often the key.


  • Louis Couturat, Les nouvelles langues internationales. Paris: Hachette. 1907. With Léopold Leau. Republished 2001, Olms.
  • Louis Couturat, Étude sur la dérivation dans la langue internationales. 1910. Paris: Delagrave. 100 p.

See also