You must be using big words in case someone does the analysis on HN comments.
Definitions:
Vernacular: ??
Lexical analysis (in this case): ratio of unique words to non unique words
Lexical density: What persent of the words is unique?
The paragraph in quotes is copied and pasted from when I wrote that a few weeks ago, there's a definition in parentheses following lexical density. Analysis is a word that should not need a definition attached to it (you have used it yourself in your comment.)
Vernacular is commonly used in the United Kingdom. Google will provide you with a definition.
Definitions: Vernacular: ?? Lexical analysis (in this case): ratio of unique words to non unique words Lexical density: What persent of the words is unique?