What exactly does "Spirit-Filled" mean?

I recently saw this being used on a church [website](https://www.theliftchurch.tv/) , where they describe themselves as "a regional, Spirit-filled, Word-based church led by Pastors Keith and Margie Nix." Now, I understand "Word-based". They hold to *sola scriptura*. That's easy. But it kind of threw me to see "Spirit-filled" as a kind of "proper noun" description of a denomination. What exactly should this tell me about their theology? Or is there no one definition?