IPA: /ˌlɛksɪkəˈlɒdʒɪkəl/
KK: /lɛksɪkəˈlɑgɪkəl/
Related to the study of words and their meanings, especially in dictionaries.
The lexicological analysis of the text revealed many interesting word choices.
Lexicological → It is formed from "lexicon" (from Greek "lexikon", meaning word or dictionary) and "-logical" (from Greek "logikos", meaning pertaining to reason or study). The word "lexicological" refers to the study or analysis of words and their meanings, particularly in dictionaries.
Think of a 'dictionary' ('lexicon') and the study of 'words' ('-logical') — that's what lexicological means.