MDEX Engine 6.1.4 includes new default stemming dictionaries for the following languages:

The new dictionaries provide better search results because the dictionaries contain improved variants that are based on linguistic declination of proper nouns, nouns, and adjectives. (Prior releases included stemming dictionaries that had more simple rule-based variants.)

There were also minor improvements to the English stemming dictionary that are described in the release notes.

For details about stemming, see "Using Stemming and Thesaurus" in the MDEX Engine Developer's Guide.