1.
If something changes ~ or is ~ different, it changes a lot or is very different. (FORMAL)
The percentage of girls in engineering has increased ~...
The price was ~ higher than had been expected...
= significantly
ADV: ADV with v, ADV adj/prep
2.
If you say that something is ~ correct or unchanged, you mean that it is mostly correct or mostly unchanged. (FORMAL)
He checked the details given and found them ~ correct...
ADV: ADV adj