Lingua Philosophica

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Lingua philosophica ("the philosophical language") is a very early constructed language invented by George Dalgarno (c. 1626-1687), a Scottish schoolteacher, published by him in his Ars Signorum ("Art of Signs"), a lengthy essay published in 1661 which both attempted to set out the philosophical basis of language, as Dalgarno perceived it, and to sketch (in some detail) a constructed language that would, ideally, represent each idea by a word, related ideas by related words, and be sufficiently rational to train its learners' minds in philosophical rigor.

Whether or not Dalgarno succeeded at this task, his Lingua Philosophica is one of the earliest fully functional constructed languages, and most likely the earliest in Europe. It consists of:

A lengthy list of roots corresponding to what Dalgarno believed to be basic linguistic concepts or ideas.
A much briefer grammatical apparatus (chiefly verbal and adjectival inflexional suffixes) which could be used with these roots.
A "Lexicon" of 1370 Latin words glossed in Lingua Philosophica, often by compounding existing roots
A set of writings, primarily translations, in Lingua Philosophica. These include:
  1. A foreword addressed to King Charles II.
  2. The Lord's Prayer in Lingua Philosophica.
  3. A translation of the first chapter of Genesis.
  4. Translations of the first five Psalms.
  5. Translations of two short Fables of Æsop.

There are also several example sentences given in the main body of the Ars Signorum.

Sounds

Vowels

i, e, ɛ, a, ɔ, o, u[1] Diphthongs: ai, ei, ɔi

Consonants

Labials Coronals Palatas Velars
Voiceless stops p t k
Voiced stops b d g
Nasals m n ŋ[2]
Voiceless fricatives f[3] s ʃ
Voiced fricatives v
Approximants l, r
  1. ^ These are actually represented by the symbols i, e, η, a, o, υ, u. This is an interpretation of Dalgarno's somewhat obscurely expressed intent, as he may have intended a symmetrical 7-vowel system.
  2. ^ Represented by the letter f. It is unclear whether it was actually intended to be pronounced [f]; it was, however, intended to fill the slot of a velar nasal.
  3. ^ See ŋ above