The quality or state of being beamy; the characteristic of being bright, shining, or radiating warmth and happiness.
From beamy (adjective form of beam, with suffix -y) combined with the noun suffix -ness. The term emerged to describe the qualities of brightness and warmth both literally and emotionally.
English loves to turn adjectives into abstract nouns—'beaminess' captures the whole vibe of brightness, which is why sunbathers and happy people are often described as 'beaming'!
Complete word intelligence in one call. Free tier — 50 lookups/day.