What does "flattening" mean?

The act, or the result of making something flat or flatter

Flattening

Common synonyms include: compression, data flattening, delayered, demolition, ellipsoid flattening, ellipsoid oblateness.

noun, verb

noun, verb ·3 syllables ·Uncommon ·College level

Noun

1
The act, or the result of making something flat or flatter uncountable, usually
2
A flattened part of something uncountable, usually
"The Earth is a sphere that has flattenings at the poles."

Verb

"Tom is working on flattening his stomach."