Adjuvilo is a constructed language created in 1910 by Claudius Colas under the pseudonym of "Profesoro V. Esperema". Although it was a full language, it may not have been created to be spoken. Many believe that as an Esperantist, Colas created Adjuvilo to help create dissent in the then-growing Ido movement. Colas himself called his language simplified Ido and proposed several reforms to Ido.
Colas created a nearly complete grammar, but did not create a new vocabulary. Adjuvilo uses mainly the vocabulary of Ido with modifications according to the grammatical changes of Ido. Colas in some cases reestablishes the Esperanto forms of words and even constructed some new words like sulo for "sun" (Ido/Esperanto: suno) and dago for "day" (Ido: dio, Esperanto: tago).
Phonology and orthography
Like Ido, Adjuvilo has five vowel phonemes. The vowels and are interchangeable depending on speaker preference, as are and . The combinations /au/ and /eu/ become diphthongs in word roots but not when adding affixes.
Adjuvilo also uses the same orthography as Ido: the 26 letters as the English alphabet and ISO Basic Latin alphabet with three digraphs and no ligatures or diacritics. The only modification is that the stress is always on the penultimate syllable like in Esperanto, whereas in Ido in the infinitive of the verbs the last syllable is stressed.
The digraphs are:
Grammar
The definite article for all genders is in the singular la and in the plural las but the form la can be valid for the plural. You may elide the final a of the article, replacing it with an apostrophe, as equally before a consonant as before a vowel. Example: l'artiklo, l'profesoro. All nouns end in the singular in -o and in the plural in -s. Example: la lando (the land) and las landos (the lands). Like Ido and Esperanto, Adjuvilo has no indefinite article Adjuvilo does not have grammatical genders. Nouns for females are all derived from the masculine form by using the affix -in. Example: filio (son) and filiino (daughter). The genitive and the indirect object cases are expressed by prepositions. Example: Me donin la libro de la patro a mea filio (I gave my father's book to my son). The adjective ends on -a, and also receives -s in the plural. It is placed before the noun. Example: un bona viro (a good man), belas juvenilos (beautiful girls), granda monto (a big mountain). The positive form is indicated by tam (as). Example: Vos estan tam bonas quam nos. (You are as good as us). The comparative form is indicated by plu (more) and men (less). Example: El estan plu bela quam il. (She is more beautiful than he). Tia libro estan men interesanta quam cia. (That book is less interesting than this [one]). The superlative form is indicated by la pley (most) and la min (least). Example: Adjuvilo estan la pley facila linguo ex omnas linguos. (Adjuvilo is the easiest language of all languages). Hike estan la min bela urbo de omnas. (Here is the least beautiful city of all).