adj. /ill-(y)OO-minn-ESS-uhnt/

1. Referring to the state of being both illuminated and luminescent,
2. thus suggesting the quality of having outstanding attributes on the point of shining.
3. Having connotations of the supernatural glowing of a human halo or aura and its ascribed distinctions of enlightenment, sanctity, and charisma.

(an amalgamation of illuminated & luminescent)

derivatives:
noun = illuminescence

The phenomenon of having to come out as bisexual to the same person/people repeatedly because they assumed or hoped that your sexuality was a "phase." Refers less to the holiday and more to the 1993 Bill Murray comedy film in which the main character experiences the same day over and over.