substantially
UK: səbˈstænʃəli | US: səbˈstænʃəli
adv. to a great or significant extent
adv. in a strong, solid, or essential manner
adv. (law) in substance; materially
The word "substantially" originates from Latin substantia (sub "under" + stantia "standing"), reflecting the idea of "essential nature" or "foundation." Over time, it evolved through Old French substantiel into English, retaining the core notion of something being solid, real, or materially significant. The suffix -ly converts the adjective "substantial" into an adverb, emphasizing manner or degree.
The company's profits increased substantially last quarter.
The building was substantially damaged in the storm.
Her argument was substantially correct, though minor details were flawed.
The law has been substantially revised to address modern concerns.
The two proposals differ substantially in their approach to the problem.