1. twilight sleep a state of general anesthesia in which the person retains a slight degree of consciousness; can be induced by injection of scopolamine or morphine
  2. twilight zone the ambiguous region between two categories or states or conditions (usually containing some features of both)
  3. clothesless possessing no clothing
  4. daylight savings time during which clocks are set one hour ahead of local standard time; widely adopted during summer to provide extra daylight in the evenings
  5. light speed the speed at which light travels in a vacuum
  6. flightless incapable of flying
  7. glide slope the final path followed by an aircraft as it is landing
  8. lightless giving no light
  9. flight of steps a stairway between one floor or landing and the next
  10. lightlessness total absence of light
  11. lightsomeness the gracefulness of a person or animal that is quick and nimble
  12. delightful greatly pleasing or entertaining
  13. twilight the time of day immediately following sunset
  14. daylight saving time during which clocks are set one hour ahead of local standard time; widely adopted during summer to provide extra daylight in the evenings
  15. delightfully in a delightful manner
  16. light source any device serving as a source of illumination
  17. showy lady slipper pale pink wild orchid of northeastern America having an inflated pouchlike lip
  18. thigh-slapper a joke that seems extremely funny
  19. fall asleep change from a waking to a sleeping state
  20. shirtsleeves not wearing a jacket