radiance, shine, sparkle, gleam, twinkle
輝 centers on bright, radiant light: shining, sparkling, gleaming, or twinkling. All the given meanings are direct expressions of this luminous quality.
輝 combines 光 (light) and 軍, which likely contributes the sound キ. Together they express the idea of light radiating or shining.
Light 光 radiates from an army 軍 of shining soldiers, their armor sparkling and gleaming.
For キ, imagine a radiant key (キー) that unlocks a treasure chest, and as it turns, a brilliant light shines out: key -> キ.
to shine; to sparkle; to twinkle; to glitter; to glisten
brightness; brilliance; brilliancy; radiance; glitter
brilliant; glorious; glittering; bright; splendid (e.g. achievement, success); promising (e.g. future)
brightness; luminance
to shine; to glitter
brightness; splendour; splendor
pyroxene; augite
My Brilliant Career (novel by Miles Franklin)
jadeite
pigeonite
spodumene
Japanese calendar's six labels, indicating how auspicious each day is
to shine clearly
kanoite
augite
eclogite
decalescence
hedenbergite
to shine brilliantly
to shine brilliantly; to shine radiantly