What is the meaning of Excelsior?

Loftier, yet higher, more elevated; ever upward.

More surpassing, more excelling.

A greeting, farewell or acclamation, presently associated with comic book fandom and famous comic book writer Stan Lee, but continuing a long tradition of parodies of the New York State motto, first by Longfellow and continuing through Thurber to Lee.

Excelsior (Longfellow) on Wikipedia.Wikipedia

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