1908 Daily Chron. 7 Sept. 7/2 The new language has been named ‘Ido’, and its inventor [M. de Beaufront, of Geneva] claims that it is easier to learn and is more methodical than Esperanto, its parent.

1922 O. Jespersen Lang. xviii. 347 Anyone who has written much in Ido [etc.].

1946 H. Jacob On Choice of Common Lang. 79 The British section of the Ido-union.

1926 Encycl. Brit. III. 906/1 In 1907 two Frenchmen, Messrs. Couturat and de Beaufront, produced a modification of Esperanto which they named simplified Esperanto. Owing to Esperantist protests, the ‘linguo internaciona’ was renamed Ido... The Idists claim that Ido is Esperanto rendered more scientific and natural.

1926 Encycl. Brit. III. 906/1 The chief Idist grammarian, Dr. Max Talmey, advocates what he calls ‘Improved Ido’ or ‘Ilo’ or ‘Arulo’.

1928 O. Jespersen Internat. Lang. i. 24 The practical experiences of Volapükists, Esperantists and Idists..have shown that the fears of sceptics are groundless with regard to pronunciation.

1947 H. Jacob Planned Auxiliary Lang. 57 Idists practising the language for many years.

1916 H. G. Wells Mr. Britling sees it Through i. v. §10 ‘There would be no English, no Germans, no Russians. Just Esperantists.’..‘Or Idoists,’ said Herr Heinrich.