What is the meaning of Excelsior?

Loftier, yet higher, more elevated; ever upward.

More surpassing, more excelling.

A greeting, farewell or acclamation, especially associated with comic book fandom and famous comic book writer Stan Lee.

The size of type between Norse and brilliant, standardized as 3-point.

Stuffing material (as for furniture and mattresses) made of slender, curled woodshavings, as a substitute for hair.

comparative degree of excelsus

Source: wiktionary.org