For English good dictionaries Longman. They assume that the native language of their readers are not English, so the interpretation there are very simple and are often given special language explanations. In particular, they have such an Activator, which presents words that represent the main "concepts" and related words and expressions with additional explanations. Can't find an example online, but like this (that looks like their old edition):
They have also dictionaries of idioms and conventional dictionaries (designed, again, to insufficient knowledge of the language). There are electronic versions.