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Interlingua is distinguished by its many dictionaries to and from other languages. Interlingua dictionaries are notable for their comprehensiveness; they tend to be larger than for other auxiliary languages. Some of the larger dictionaries are presented here.

The first Interlingua dictionary, titled Interlingua-English: A Dictionary of the International language, is often referred to simply as the Interlingua-English Dictionary (IED). First published in 1951, the IED still serves as an authoritative reference work, partly because its entries display the etymological connections between words which are often obscured in other languages. The IED was compiled by Alexander Gode and his research staff.

The 27,000 words of the IED are supplemented by the 25,000-word Supplementary List. While not a full dictionary, the list is a useful adjunct to the IED because many Interlingua words are identical, or nearly identical, to their counterparts in English. Thus, English readers immediately recognize the Interlingua words and have no need for translations. Author Piet Cleij collects the entries during his work on Interlingua dictionaries.

The 263-page Worterbuch Deutsch-Interlingua (WDI), with 45,000 to 50,000 entries, was compiled by Andre Schild. Schild, the first Secretary General of the Union Mundial pro Interlingua, held this post from 1955 to 1958. A new edition of the WDI was published in 2006. Some other large Interlingua dictionaries include

• The 382-page Concise English-Interlingua Dictionary by F. P. Gopsill and Brian C. Sexton
• The 55,000-entry Dictionario Francese-Interlingua by Piet Cleij, Professor of French, is under preparation
• The Dicionário Português-Interlíngua by Euclides Bordignon, with 330 pages and about 30,000 entries
• The Svensk-Interlingua Ordbok, a Swedish-Interlingua dictionary with 90,000 entries. Written by Pian Boalt, it appears in paper and in electronic formats at Softbear and Babylon
• The Woordenboek Interlingua-Nederlands, an Interlingua-Dutch dictionary by Piet Cleij with 50,000 entries, in paper and in electronic format at Softbear
• The Woordenboek Nederlands-Interlingua, a Dutch-Interlingua dictionary by Piet Cleij with more than 140,000 entries

Many Interlingua dictionaries are available online at the Babylon lingual website. In 2001, Panorama in Interlingua reported that Babylon was distributing the Interlingua-English Dictionary, by download or subscription, at an average rate of 846 issues a day. Panorama characterized this as the fastest distribution of auxiliary language materials in history.

On the Interlingua Wiktionary site, some of the Wictionaries include

• English-Interlingua, 50,000 entries
• Interlingua-German, 80,000 entries
• German-Interlingua, 45,000 entries
• Interlingua-Romanica, 80,000 entries
• Romanica-Interlingua, 80,000 entries

While not yet transferred to the main Wiktionary, they can be consulted.

• Cleij, Piet and Breinstrup, Thomas. "Interlingua es ric in grande dictionarios". Panorama in Interlingua, 2006, Issue 3.

• "Interlingua face record historic" (Interlingua makes historic record). Panorama in Interlingua, 2001, Issue 1.

• Interlingua Wiktionary

• Woordenboek Interlingua Nederlands

• Union Mundial pro Interlingua