Translating legal terms in contracts accurately is essential if every party is to understand and agree to the terms set out. A small misreading can have significant consequences. If you are looking for a glossary of English legal terms or reference material, this article brings together ten authoritative sources that will help you do your research and check whether the translation of the term you are after is the right one.
To avoid mistakes in legal translation, reliable reference sources are essential. Specialist dictionaries and glossaries provide precise definitions and the right context for legal terms. Below are ten online glossaries that you may find extremely useful.
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10 essential glossaries for translating English legal terms correctly

- Black’s Law Dictionary (Monolingual) – Widely regarded as the gold standard in English legal terminology. It is used extensively by lawyers and judges across the common-law world. This dictionary is an indispensable tool for any legal professional working in that tradition. Its definitions are exhaustive and provide historical and case-law context that enriches your understanding of legal terms. Its focus on the United States legal system may, however, limit how far it applies in other jurisdictions. See:See here).
- IATE (Interactive Terminology for Europe) (Bilingual) – The European Union’s terminology database, with equivalents in several languages. It is an indispensable source for European legal texts. The breadth of this database is impressive, covering a multitude of languages and specialist terminologies. It is particularly useful for translators working with European Union documents. That said, the quality and depth of the entries can vary, and you will sometimes need to supplement the information with other sources. See:See here).
- TERMIUM Plus (Bilingual) – The Government of Canada’s glossary of legal terms in English and French, particularly useful in Canadian law contexts. It stands out for its accuracy and for the quality of its definitions. It is an essential tool for translators working between English and French, especially in Canadian settings. The interface is intuitive, although it would benefit from more frequent updates to reflect recent changes in terminology. See:See here).
- Law.com Legal Dictionary (Monolingual) – Provides clear definitions of legal terms used in US legal practice. Its definitions are clear and to the point, which makes it an excellent reference for students and professionals who need a quick grasp of legal terms. Its scope is more limited, however, than that of other, more extensive dictionaries. See:See here).
- Supreme Court of California glossary (Bilingual) – Legal translations in English and Spanish as used in the US court system. This resource is invaluable for interpreters and translators working in bilingual court settings. It provides accurate, recognised equivalents for legal terms in Spanish and English. It would benefit from including more examples of use in context to aid understanding. See:See here).
- Oxford Dictionary of Law (Monolingual) – An academic resource covering British legal terminology that is widely used in international law. This dictionary is a reliable reference for British English, offering detailed definitions and contexts of use. It is particularly useful for anyone familiar with the UK legal system. Its British focus may, however, not suit those working in other jurisdictions. See:See here).
- Cambridge Law Dictionary (Monolingual) – A dictionary of English legal terms with practical examples. It stands out for how accessible and practical it is. Although its scope is narrower than that of other specialist dictionaries such as Black’s Law Dictionary, it is an excellent tool for students and professionals looking for clear, concise definitions with examples of use in context. It is especially useful for those starting out in law. See:See here).
- Bailii (British and Irish Legal Information Institute) (Monolingual) – A database of British case law with a glossary of legal terms. More than a simple glossary, Bailii is a database giving access to judgments and legal documents from Britain and Ireland. It is an invaluable source for lawyers who need concrete legal references and precedents. Its interface may not be the most modern, but the depth of the information it offers makes it an indispensable resource. See:See here).
- Diccionario de Términos Legales by Louis Robb (Bilingual) – A classic legal translation resource with definitions in English and Spanish. A classic in legal translation that remains a standard academic reference. Although its print edition makes it less accessible than other online resources, its content is of high quality. It is particularly valuable for anyone working on legal translation between English and Spanish. See:See here).
- Merriam-Webster’s Dictionary of Law (Monolingual) – An English dictionary specialising in US law, with accessible explanations. It is an excellent choice for anyone looking for accessible definitions without academic complexity. Its focus on US law makes it useful for legal professionals and students who want to understand terms in a straightforward way. Unlike other legal dictionaries, it concentrates on practical explanations rather than detailed readings of case law. See:See here).
Translating legal documents calls for precision and specialist knowledge. Working with reliable glossaries ensures that English legal terms are interpreted correctly and that ambiguity is avoided.
If you would like to learn more about legal translation or improve your legal English, take a look at our other articles:
Frequently asked questions about English legal terms
A monolingual dictionary gives detailed definitions of legal terms in a single language, whereas a bilingual dictionary provides equivalents and translations between two languages.
It depends on the source. Government and academic glossaries tend to be highly reliable, whereas non-specialist sites may contain errors.
It is not advisable. Without a specialist glossary you could misread key terms and create ambiguity in the translation.
A specialist human translator is always preferable, as automated tools do not capture legal context properly.
Taking specialist courses, reading legal glossaries and practising with real documents are all effective ways to improve your understanding of legal English.




