1. (n.) A discharge of atmospheric electricity, accompanied by a vivid flash of light, commonly from one cloud to another, sometimes from a cloud to the earth. The sound produced by the electricity in passing rapidly through the atmosphere constitutes thunder.

2. (n.) The act of making bright, or the state of being made bright; enlightenment; brightening, as of the mental powers.

3. (vb. n.) Lightening.

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