English-English Dictionary Merriam-Webster OnLine Pronunciation Dictionary with Audio
English-English Dictionary Dictionary.com is a multi-source dictionary search service produced by Lexico Publishing Group, LLC, a leading provider of language reference products and services on the Internet.
English-English Dictionary The Free Dictionary
Acronyms and Abbreviations Acronym Finder
English-English Dictionary The New Dictionary of Cultural Literacy
English-English Dictionary...and last, but definitely not least! (my favorite)
English-German Dictionary LEO Deutsch-Englisch Wörterbuch
Croatian-English and English-Croatian Dictionary Taktika Nova
Croatian-English and English-Croatian Dictionary Hrvatsko engleski rječnik i englesko hrvatski online rječnik
Finally... If you cannot find a word in any of these dictionaries, you can always try and google it... Good luck with your word search!