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MOT sanakirjat
This is a great dictionary especially when you want to use Finnish. Sign in using your university credentials so you can use the service wherever you are.
The Free Dictionary
This dictionary offers a great deal of information about words, their synonyms and antonyms, including phrasal verbs and idioms that contain the word you look up.
Dictionary.com
A good dictionary that offers the meaning and etymology (=the history) of words as well as synonyms and antonyms (=opposites). You can also listen how the words are pronounced.
Merriam-Webster
A general dictionary that you can search for individual words and synonyms. You can also listen how the words are pronounced.
Merriam-Webster Visual Dictionary
Learn new words through pictures! Contains detailed pictures on 15 different themes.
Oxford Collocations Dictionary
Collocations are words that occur together (e.g. "big brother", "fast food", "global warming"), so using a collocations dictionary might help when you're for example not sure which adjective you should use to describe something or which preposition should be used with a certain verb. Just type in a word and you will get examples of words that commonly occur with that word.
Acronym Finder
Find out what any acronym, abbreviation or initialism stands for.
Abbreviations.com
Abbreviations and acronyms from different fields. You can search the abbreviations by field, alphabetically or with a search engine. Alphabetical browsing is not advisable as there are thousands of abbreviations and acronyms to each letter.