Mira ( aka Unilingua ) is an artificially-constructed auxiliary language (conlang) developed and published by Paris-based author Noubar Agopoff as a serious medium for easy and logical international communication. Mirad is categorized by constructed language aficionados as philosophical because its vocabulary is mapped letter-by-letter to a semantic ontology or thesaurus. Also, the wordstock of Unilingua is considered a priori, that is, there is no deliberate association with words or roots in existing natural languages. The vocabulary is "from scratch", yet based on internal lexical and semantic rules that help the learner to construct and deconstruct derivations logically, mnemonically, and consistently.