On the example of the recent edition of the Frequency Dictionary of Czech we describe and explain some new general principles that should be followed for getting better results for practical uses of frequency dictionaries. It is mainly adopting average reduced frequency instead of absolute frequency for ordering items.
The formula for calculation of the average reduced frequencyis presented in the contribution together with a brief explanation, including examples clarifying the difference between the measures. Then, the Frequency Dictionary of Czech and its parts are described.