IPA: //sʌbˈriːdʒənl//
KK: /sʌbˈriːdʒənl/
Relating to a smaller area within a larger region.
The subregional conference focused on local environmental issues.
A competition or event that takes place at a level lower than the regional level, often used to qualify participants for a larger tournament.
The subregional tournament will determine which teams advance to the regional finals.
Subregional → It is formed from "sub-" (meaning under or below) and "regional" (from Latin "regio", meaning region). The word "subregional" refers to something that is under or part of a larger region.
Think of something that is 'under' ('sub-') a larger 'region' — that's why subregional refers to a smaller area within a larger one.