Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

Word Explorer
Children's Dictionary
Help
Help
Help
     

light·year

light-year

 
pronunciation:
laIt yir
features:
Word Explorer
part of speech: noun
inflections: light-years
definition: a unit of distance equal to the distance light can travel in one year, about six trillion miles.
Word Explorer
See
  light, measurement, outer space, space