IPA: //ˌmɒn.jʊˈmɛn.təl//
KK: /ˈmɒn.jʊˌmɛn.təl/
Something that is impressively large, significant, or enduring, often used to describe great achievements or qualities.
The monumental statue stood tall in the center of the city, attracting visitors from all over.
Monumental → It is formed from "monumentum" (from Latin, meaning a memorial or reminder) and the suffix "-al" (meaning pertaining to). The word "monumental" refers to something that is pertaining to a monument, often implying great size or significance.
Think of a 'monument' as a large structure that serves as a reminder of something important, and the '-al' indicates that it relates to that structure.