IPA: //ˈflætɪst//
KK: /flætɪst/
The most level or even surface without any bumps or raised areas.
This is the flattest area in the entire park, perfect for picnics.
Comparative: flatter
Superlative: flattest
Flattest → It is formed from "flat" (from Old English *flaet*, meaning level or smooth) and the suffix "-est" (meaning the most). The word "flattest" describes something that is the most level or smooth compared to others.
Think of something being the "most level" or "smooth" — that's what flattest means.