IPA: /ɪˌkliːziˈæstɪkəl/
KK: /ɪˌkliːziˈæstɪkəl/
Related to a church or its organization, often used to describe things like church architecture or clothing.
The cathedral is known for its beautiful ecclesiastical design.
Ecclesiastical is formed from "ecclesia" (from Greek "ekklēsía", meaning assembly or church) and the suffix "-ical" (meaning pertaining to). The word refers to matters pertaining to the church or religious assembly.
Think of 'ecclesia' as an assembly or church, and remember that 'ecclesiastical' means related to the church.