Acronyma - The largest database of acronyms and abbreviations on the web. I tried some acronyms in Portuguese (ex: CCBB, ABNT), English (ex.: IMNSHO, BRB, YMMV, IANAL) and the only one that I know in French (RSVP) and they worked almost fine. But we don't use so much abbreviations in Portuguese, we usually use for places and organizations, and I know just a few in English, so it's better you try. And I missed a Latin search there for abbreviations like i.e. and e.g.. Anyway, it's a nice tool to search if you have any doubt.

PS.: não achei o CQD lá, mas já postei a sugestão.