(My apologies, but my Polish is not good enough to answer in it.) As Jacek says, it's not possible (but it's a good idea, I'll try to make it happen!). What you can do, however, is to use Spotlight instead: 1. press Cmd+space, 2. type the word, and then 3. press Cmd+L to jump to the definition.
Dictionaries - na taki słownik angielsko-polski czekałem!
(My apologies, but my Polish is not good enough to answer in it.) As Jacek says, it's not possible (but it's a good idea, I'll try to make it happen!). What you can do, however, is to use Spotlight instead: 1. press Cmd+space, 2. type the word, and then 3. press Cmd+L to jump to the definition.