It's really new dictionary, which is based on the new Belarusian grammar database. This database contains ~265ths paradigm and ~4.5mln wordforms. It's most complete list of words of Belarusian language for today. Dictionary for LibreOffice doesn't include all words, of course, but only words from official academic dictionaries. This database will be officially released at the beginning of October, 2021 under the label of the Institute of Linguistics of the National Academy of Sciences of Belarus at https://github.com/Belarus/GrammarDB. Old dictionary doesn't contain so complete list of wordforms (there are many missed words) and was based on old lists of words from different sources. "Official" means official orthography. There is also widely-used "Classical Orthography" or "Taraškievica" (https://en.wikipedia.org/wiki/Tara%C5%A1kievica). Rules for official orthography were revised in 2008. This dictionary fully correspond with new (2008) rules and academic dictionaries. Old LibreOffice dictionary contained words by 1957 rules. Differences between 1957 and 2008 rules are not so big, but they exist. Change-Id: Ie55bc3a946364a13793e3b55522612c69345b57d Reviewed-on: https://gerrit.libreoffice.org/c/dictionaries/+/121746 Tested-by: Andras Timar <andras.timar@collabora.com> Reviewed-by: Andras Timar <andras.timar@collabora.com>