"Brilliantness" is a word in ENGLISH

The quality or state of being bright; splendor; luster; brilliancy; clearness.

Brilliancy of success or effort; splendor; brilliant show; striking effect; glory; renown.

The state of being effulgent; extreme brilliancy; a flood of light; great luster or brightness; splendor.

Splendor; brilliancy; luster; hence, a star.

That quality in a person or thing which secures general praise or honor; that which brings or gives renown; an …

That which irradiates or is irradiated; luster; splendor; irradiation; brilliancy.

Brilliancy; splendor; brightness; glitter.

Great brightness; brilliant luster; brilliancy; as, the splendor ot the sun.

Brilliancy; glory; as, the splendor of a victory.