noun, adjective, -er, -est, verb, light⋅ed or lit, light⋅ing.| 1. | something that makes things visible or affords illumination: All colors depend on light. |
| 2. | Physics.
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| 3. | the sensation produced by stimulation of the organs of sight. |
| 4. | an illuminating agent or source, as the sun, a lamp, or a beacon. |
| 5. | the radiance or illumination from a particular source: the light of a candle. |
| 6. | the illumination from the sun; daylight: We awoke at the first light. |
| 7. | daybreak or dawn: when light appeared in the east. |
| 8. | daytime: Summer has more hours of light. |
| 9. | a particular light or illumination in which an object seen takes on a certain appearance: viewing the portrait in dim light. |
| 10. | a device for or means of igniting, as a spark, flame, or match: Could you give me a light? |
| 11. | a traffic light: Don't cross till the light changes. |
| 12. | the aspect in which a thing appears or is regarded: Try to look at the situation in a more cheerful light. |
| 13. | the state of being visible, exposed to view, or revealed to public notice or knowledge; limelight: Stardom has placed her in the light. |
| 14. | a person who is an outstanding leader, celebrity, or example; luminary: He became one of the leading lights of Restoration drama. |
| 15. | Art.
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| 16. | a gleam or sparkle, as in the eyes. |
| 17. | a measure or supply of light; illumination: The wall cuts off our light. |
| 18. | spiritual illumination or awareness; enlightenment. |
| 19. | Architecture.
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| 20. | mental insight; understanding. |
| 21. | lights, the information, ideas, or mental capacities possessed: to act according to one's lights. |
| 22. | a lighthouse. |
| 23. | Archaic. the eyesight. |
| 24. | having light or illumination; bright; well-lighted: the lightest room in the entire house. |
| 25. | pale, whitish, or not deep or dark in color: a light blue. |
| 26. | (of coffee or tea) containing enough milk or cream to produce a light color. |
| 27. | to set burning, as a candle, lamp, fire, match, or cigarette; kindle; ignite. |
| 28. | to turn or switch on (an electric light): One flick of the master switch lights all the lamps in the room. |
| 29. | to give light to; furnish with light or illumination: The room is lighted by two large chandeliers. |
| 30. | to make (an area or object) bright with or as if with light (often fol. by up): Hundreds of candles lighted up the ballroom. |
| 31. | to cause (the face, surroundings, etc.) to brighten, esp. with joy, animation, or the like (often fol. by up): A smile lit up her face. Her presence lighted up the room. |
| 32. | to guide or conduct with a light: a candle to light you to bed. |
| 33. | to take fire or become kindled: The damp wood refused to light. |
| 34. | to ignite a cigar, cigarette, or pipe for purposes of smoking (usually fol. by up): He took out a pipe and lighted up before speaking. |
| 35. | to become illuminated when switched on: This table lamp won't light. |
| 36. | to become bright, as with light or color (often fol. by up): The sky lights up at sunset. |
| 37. | to brighten with animation or joy, as the face or eyes (often fol. by up). |
| 38. | bring to light, to discover or reveal: The excavations brought to light the remnants of an ancient civilization. |
| 39. | come to light, to be discovered or revealed: Some previously undiscovered letters have lately come to light. |
| 40. | hide one's light under a bushel, to conceal or suppress one's talents or successes. |
| 41. | in a good (or bad) light, under favorable (or unfavorable) circumstances: She worshiped him, but then she'd only seen him in a good light. |
| 42. | in (the) light of, taking into account; because of; considering: It was necessary to review the decision in the light of recent developments. |
| 43. | light at the end of the tunnel, a prospect of success, relief, or redemption: We haven't solved the problem yet, but we're beginning to see light at the end of the tunnel. |
| 44. | see the light,
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| 45. | shed or throw light on, to clarify; clear up: His deathbed confession threw light on a mystery of long standing. |

The type of electromagnetic wave that is visible to the human eye. Visible light runs along a spectrum from the short wavelengths of violet to the longer wavelengths of red. (See photon.)
light
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light (līt)
n.
Electromagnetic radiation that has a wavelength in the range from about 4,000 (violet) to about 7,700 (red) angstroms and may be perceived by the normal unaided human eye.
Electromagnetic radiation of any wavelength.
bring to light
Reveal or disclose something previously hidden or secret, as in After careful investigation all the facts of the case were brought to light. This term uses light in the sense of "public knowledge." [First half of 1500s]