Welcome to PONS.
PONS is one of the most famous dictionaries used in Germany. The biggest advantage for every pupil is that there is a free online version which can be used 24 hours. Another advantage in comparison with LEO is that the entries are controlled by real experts and cannot be changed by 'normal' users.
Enjoy PONS under this link:
Comments of our users
Pons is great! Use it to translate the words you do not understand ;-)