To send out light, heat, or energy in all directions from a central point.
From Latin 'radiare' meaning to emit rays, derived from 'radius' meaning ray or spoke of a wheel. The metaphor of rays spreading like spokes helped describe how energy spreads outward.
The word 'radiation' comes from 'radius'—literally meaning spokes of a wheel—because invisible rays spreading from a source looked like spokes spreading from the hub of a wheel to ancient observers!
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