Grow
One possibility is growth.
Growing or expanding
A ten letter word for the process is metabolism. An 11 letter word is respiration.
cash cash
There is an 8-letter word "becoming." 7-letter words are combine, combing, confine, fencing, and meowing.
magnify enlarge
The 7-letter word meaning to gradually break down is "dissolve." It refers to the process of a substance becoming incorporated into a liquid, leading to a gradual breakdown or disintegration. This term can also metaphorically apply to other gradual changes or reductions.
desensitized
process
Processors with a smaller word size can process more data during each processor cycle.
mummify
PRESERVATION?