noun

• (physics) electromagnetic radiation that can produce a visual sensation
  "the light was filtered through a soft glass window"
• any device serving as a source of illumination
  "he stopped the car and turned off the lights"
• a particular perspective or aspect of a situation
  "although he saw it in a different light, he still did not understand"
• the quality of being luminous; emitting or reflecting light
  "its luminosity is measured relative to that of our sun"

verb

• make lighter or brighter
  "This lamp lightens the room a bit"
• begin to smoke
  "After the meal, some of the diners lit up"
• to come to rest, settle
  "Misfortune lighted upon him"
• cause to start burning; subject to fire or great heat
  "Great heat can ignite almost any dry matter"