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The Collaborative International Dictionary

Ido \I"do\ ([=e]"d[=o]), n. An artificial international language, selected by the ``Delegation for the Adoption of an Auxillary International Language'' (founded at Paris in 1901), made public in 1907, and subsequently greatly revised and extended by a permanent committee or ``Academy.'' It is a revised and simplified form of Esperanto. It combines systematically the advantages of previous schemes with a thoroughly logical word formation, and has neither accented constants nor arbitrarily coined pronominal words. For each idea that root is selected which is already most international, on the principle of the ``greatest facility for the greatest number of people.'' The word ``Ido'' means in the language itself ``offspring.'' The official name is: ``Linguo Internaciona di la Delegitaro (Sistema Ido).'' -- I"dism, n. -- I"dist, n.

Douglas Harper's Etymology Dictionary

1908, artificial language based on Esperanto, devised 1907; from Ido -ido “offspring,” suffix representing Latin -ida, Greek -ides.

Ido (language)

Ido is a constructed language created to be a universal second language for speakers of diverse backgrounds. Ido was specifically designed to be grammatically, orthographically, and lexicographically regular, and above all easy to learn and use. In this sense, Ido is classified as a constructed international auxiliary language. It is the most successful of many Esperanto derivatives, called Esperantidos.

Ido was created in 1907 out of a desire to reform perceived flaws in Esperanto, a language that had been created for the same purpose 20 years earlier. The name of the language traces its origin to the Esperanto word , meaning "offspring", since the language is a "descendant" of Esperanto. After its inception, Ido gained support from some in the Esperanto community, but following the death in 1914 of one of its most influential proponents, Louis Couturat, it declined in popularity. There were two reasons for this: first, the emergence of further schisms arising from competing reform projects; and second, a general lack of awareness of Ido as a candidate for an international language. These obstacles weakened the movement and it was not until the rise of the Internet that it began to regain momentum.

Ido uses the same 26 letters as the English ( Latin) alphabet with no diacritics. It draws its vocabulary from French, Italian, Spanish, English, German, and Russian, and is largely intelligible to those who have studied Esperanto.

Several works of literature have been translated into Ido, including The Little Prince and the Gospel of Luke. As of the year 2000, there were approximately 100–200 Ido speakers in the world.


İDO Istanbul Fast Ferries Co. Inc. (, meaning Istanbul Sea Buses) was founded in 1987 by the Istanbul Metropolitan Municipality. Originally established with a fleet of 10 seabuses built by the Kvaerner Fjellstrand shipyard of Norway, the İDO today has a fleet of 25 seabuses (with capacities ranging from 350 to 450 passengers) designed by Kvaerner Fjellstrand, Austal and the Damen Group; 10 high-speed car ferries (1200 passengers and 225 vehicles) designed by Austal and the Damen Group; 18 car ferries; 32 commuter ferries; and 1 large passenger ship. At present, the İDO is the world's largest commuter ferry operator with its 87 passenger ships and 86 piers. The company owns a total of 103 ships including its service vessels.

In 2011, the company was privatized for 30 years by the Istanbul Metropolitan Municipality.


Ido or IDO may refer to:

In places:

  • Ido, Nigeria, a Local Government Area in Oyo State
  • Ido-Osi, in Ekiti State, Nigeria
    • Ido Ekiti, a Local Government Area within Ido-Osi

In organizations:

  • International Dance Organization
  • İDO, ferry boat company in Istanbul, Turkey

In other uses:

  • Ido (name)
  • Ido (language), a constructed language
  • Indoleamine 2,3-dioxygenase, a key enzyme of tryptophan (TRP) metabolism.
  • Identification Officer, an officer in NATO Control and Reporting Centre (CRC)
  • Ido (film), a 2005 film by director Kei Fujiwara
Ido (name)

Ido is both a given name and a surname. Notable people with the name include: