sub ‧ stan ‧ tial ‧ ly /səbˈstænʃ ə li/ BrE AmE adverb
[ Word Family: noun : ↑ substance , ↑ substantiation , ↑ substantive ; adjective : ↑ substantial ≠ ↑ insubstantial , ↑ substantive ; verb : ↑ substantiate ; adverb : ↑ substantially ]
1 . very much or a lot SYN considerably :
substantially higher prices
The deer population has increased substantially in recent years.
2 . used to say that in many ways something is true, the same, different etc SYN essentially :
There are one or two minor differences, but they’re substantially the same text.