Princeton's WordNet

1. lion, king of beasts, Panthera leo(noun)

   large gregarious predatory feline of Africa and India having a tawny coat with a shaggy mane in the male

   Synonyms:
   lion, king of beasts, social lion

2. lion, social lion(noun)

   a celebrity who is lionized (much sought after)

   Synonyms:
   lion, king of beasts, social lion

3. Leo, Lion(noun)

   (astrology) a person who is born while the sun is in Leo

   Synonyms:
   king of beasts, social lion

4. Leo, Leo the Lion, Lion(noun)

   the fifth sign of the zodiac; the sun is in this sign from about July 23 to August 22

   Synonyms:
   king of beasts, social lion