What does "retrofitting" mean?

The process by which something is retrofitted.

Retrofitting

Common synonyms include: adaptable, code retrofit, compliance retrofit, heritage retrofit, modernization, modified.

noun, verb

noun, verb ·4 syllables ·Uncommon ·Advanced level

Noun

1
The process by which something is retrofitted. countable, uncountable
"One-hundred-and-six years is a long time and during that period there had been dozens of upgrades and retrofittings"

Verb

1
present participle and gerund of retrofit form-of, gerund, participle, present

"One-hundred-and-six years is a long time and during that period there had been dozens of upgrades and retrofittings"