https://jsomers.net/blog/dictionary

The author explains how the original Webster dictionary (written by Noah Webster, started in 1807 and finished 26 years later) is so much better than the current dictionaries.

I already saved the original Webster on iCloud so to install it I need to copy it:

cp -r ~/Library/Mobile Documents/com~apple~CloudDocs/Webster’s\ 1913.dictionary ~/Library/Dictionaries/

And then activate it from the Dictionary's app preferences.