Definition of "non-directional" []

• In mathematics, scalar or undirected: thus velocity has direction, but speed is non-directional.

The Century Dictionary (Public Domain)

• "The global illumination was simply an overall, non-directional background light, to stop the shadows being pitch black."
• "In 2005 they used high-power ‘Luxeon’ LEDs, i.e. non-coherent sources, combined with a large Fresnel lens to collimate the non-directional light emitted, and managed two-way audio communications over a distance of 160 km (100 miles!) between mountaintops in Tasmania."
• "When using some types of inferential statistics the alternative hypothesis may be directional or non-directional."