Encyclopaedias.

• RAE
• Spanish Languages dictionary from the Real Academia. An excellent resource for precise definitions and usage.
• Wikipedia
• Free, multi-language on-line encyclopaedia. .
• Encarta
• Partially free encyclopaedia by MSN
• Britannica
• One of the most respected English language encyclopaedia

Dictionaries.

• Cambridge Dictionaries
• Contains the reference of the Cambridge online dictionaries. The American dictionary is very useful for consulting specific terms in American English..
• Collins Dictionaries
• Includes free on-line dictionaries by Collins in English with links to a good English-Spanish dictionary and other languages.
• Wordreference
• Portal which includes various dictionaries in different combinations of languages to and from Spanish, as well as a very useful dictionary of Spanish synonyms
  The discussion forums are fairly reliable and consultations can be made for registered users.
• Allwords
• Translation dictionary from English to 5 European languages. Offers definitions of terms in English.
• Dictionary.com
• Portal with various resources:
  Dictionary of terms in English
  Dictionary of English synonyms
  Translation of English terms into over 20 languages
• Dicorama.com
• French language portal containing a links guide by category and offering specialised terminology in French.
• From Language to Language
• A collection of a number of dictionaries in a range of languages. Provides basic translations without context or references.
• Eurodict
• Multi-language Dictionary from Bulgarian to English, French and Spanish among others.
• IATE
• Offers search terms in context, providing options for the same term.
• Glosspost
• Search engine of multilingual glossaries by subjects.
• Your Dictionary
• Directory of Dictionaries and Glossaries and various languages.
• FAO
• Dictionary of Agricultural and Alimentary Terminology.
• CILF
• Contains a range of Technical Glossaries and Dictionaries in French.
• EEA
• Glossary of Technical and Environmental terms. The index of terms is well designed with the translation in various languages given below.
• UNESCO
• Dictionary of Terminology of the UNESCO.
• SOLON
• Multilingual glossary of legal terminology..
• Lexicool.com
• Portal which offers bilingual specialised dictionaries and glossaries with interesting links to other sites:
  - Hazardous Substances
  - Terminology Scientific - Medical
  - Terminology Financial - Economic
  - Technical dictionary Spanish - English / Finnish
  - Technical dictionary English - Spanish
  - Glossary of technical terms from Italian into various languages
• Trans - K
• Glossary of Technical Terminology in English - German.
• Terminometro
• Portal including dictionaries and glossaries in various languages.