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JWKTL (Java-based Wiktionary Library) is an application programming interface for the free multilingual online dictionary Wiktionary ( Wiktionary is collaboratively constructed by volunteers and continually growing. JWKTL enables efficient and structured access to the information encoded in the English and German Wiktionary language editions, including sense definitions, part of speech tags, etymology, example sentences, translations, semantic relations, and many other lexical information types. The API was first described in an LREC 2008 paper.

Further information and documentation is available from the project homepage:


JWKTL is available as open source software under the Apache License 2.0 (ASL). The software thus comes "as is" without any warranty (see the license text for more details). JWKTL makes use of Berkeley DB Java Edition 5.0.73 (Sleepycat License), Apache Ant 1.7.1 (ASL), JUnit 4.12 (CPL), and Wikokit (New BSD license). For the respective third party licenses, see NOTICE.txt.


A more detailed description of Wiktionary and JWKTL is available in our scientific articles:

  • Christian M. Meyer and Iryna Gurevych: Wiktionary: A new rival for expert-built lexicons? Exploring the possibilities of collaborative lexicography, Chapter 13 in S. Granger & M. Paquot (Eds.): Electronic Lexicography, pp. 259–291, Oxford: Oxford University Press, November 2012.
  • Christian M. Meyer and Iryna Gurevych: OntoWiktionary – Constructing an Ontology from the Collaborative Online Dictionary Wiktionary, chapter 6 in M. T. Pazienza and A. Stellato (Eds.): Semi-Automatic Ontology Development: Processes and Resources, pp. 131–161, Hershey, PA: IGI Global, February 2012.
  • Torsten Zesch, Christof Müller, and Iryna Gurevych: Extracting Lexical Semantic Knowledge from Wikipedia and Wiktionary, in: Proceedings of the 6th International Conference on Language Resources and Evaluation (LREC), pp. 1646–1652, May 2008. Marrakech, Morocco.

Please cite a JWKTL-related article if you use the software in your scientific work.

Project Background

Prior to being available as open source software, JWKTL was a research project at the Ubiquitous Knowledge Processing (UKP) Lab of Technische Universität Darmstadt, Germany under the auspices of Prof. Iryna Gurevych. Since being open source software, JWKTL is developed by multiple contributors (see CONTRIBUTORS.txt for details).


In case of any questions, please contact Christian M. Meyer.