In the field of translation, we cannot work without using a good reliable dictionary. However, dictionaries are different in the information they provide. What is the best dictionary for such a purpose?
I cannot tell you what dictionary you should use in translating, but my sense is that a good English-English dictionary and Arabic-Arabic one are advisable along an English-Arabic-English dictionary.
I don't know ideal Englsh-Polish/Polish-English and/or English-Russian/Russian-English dictionary of the general type. Reliability in this area is a matter of future
I find the best for me is Linguee (www.linguee.com) because it gives a range of real-life translations in context. But it's for advanced users because it requires experience and judgement to make a choice,
All dictionaries whether monolingual or bilingual can be used in translation. However, balanced dictionaries are always better. Try the well-known dictionaries such Longman, Merriam-Webster, Oxford, and Al-Mawrid.
dictionaries are among the tools translators need to accomplish their renderings
Depending on the type of the text to be translated, a translator needs one or more of the following dictionaries:
General monolingual and bilingual dictionaries
Specialized dictionaries
Dictionaries of synonyms and antonyms
Dictionaries of idioms
Dictionaries of slang
As regards English dictionaries, I found "Collins English Dictionary and Collins Thesaurus of English" very helpful, but this doesn't mean that a translator will not need other types of dictionaries.
I think Macmillan and Longman are the best as they are based on language corpora and feature the latest tendencies in the language (well, in the English Language)
I think all already answered the questions here but I would like to suggest one tool that I often used and someone suggested me this tool also. The tool is proz.com, it is an online platform for any translators who like to submit as member in which they can not only find connections but also can find translation project/work. Go search the website and find what you're looking for here yourself.