Thayer's Greek Lexicon

 1. to burn with zeal
  1) to be heated or to boil with envy, hatred, anger
1a1. in a good sense, to be zealous in the pursuit of good
  2) to desire earnestly, pursue
1b1. to desire one earnestly, to strive after, busy one's self
about him
1b2. to exert one's self for one (that he may not be
torn from me)
1b3. to be the object of the zeal of others, to be zealously
sought after
  3) to envy