Idiom Neutral is an international auxiliary language, published in 1902 by the International Academy of the Universal Language (Akademi Internasional de Lingu Universal) under the leadership of Waldemar Rosenberger, a St. Petersburg engineer.
The Academy had its origin as the Kadem bevünetik volapüka (literally 'International Academy of the World Language') at a congress in Munich in August 1887, was set up to conserve and perfect the auxiliary language Volapük.
Dictionaries of Idiom Neutral including an outline of the grammar were published in several European languages in 1902 and 1903.
In 1908 the Akademi which had created Idiom Neutral effectively chose to abandon it in favor of Latino sine flexione, a simplified form of Latin developed by Italian mathematician Giuseppe Peano.
Peano was appointed the director of the Akademi, and its name was changed to Academia pro Interlingua.
Comparison of adjectives (and adverbs) is with plu ... ka (more ... than), tale ... kuale (as ... as) and leplu (most, -est).
Examples are shown for the verb amar to love in the active voice; the endings do not change for person or number, except in the imperative.
Aparati deb esar adresed a shef de stasion Peterburg e deb esar asekured per vo e per votr kont; if aparati u partii de ili esero ruined u perded in voyaj, vo deb mitar nemediate otri, plasu aparati e partii ruined u perded.
Publikasion de idiom neutral interesero votr filio, kel kolekt postmarki, kause ist idiom es lingu praktikal pro korespondad ko kolektatori in otr landi.