The Collaborative International Dictionary of English v.0.48:

Covet \Cov"et\ (k?v"?t), v. t. [imp. & p. p. Covered; p. pr. &
   vb. n. Coveting.] [OF. coveitier, covoitier, F. convoiter,
   from a derivative fr. L. cupere to desire; cf. Skr. kup to
   become excited. Cf. Cupidity.]
   [1913 Webster]
   1. To wish for with eagerness; to desire possession of; --
      used in a good sense.
      [1913 Webster]

            Covet earnestly the best gifts.       --1. Cor.
                                                  xxii. 31.
      [1913 Webster]

            If it be a sin to covet honor,
            I am the most offending soul alive.   --Shak.
      [1913 Webster]

   2. To long for inordinately or unlawfully; to hanker after
      (something forbidden).
      [1913 Webster]

            Thou shalt not covet thy neighbor's house. --Ex. xx.
                                                  17.

   Syn: To long for; desire; hanker after; crave.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Covet \Cov"et\, v. i.
   To have or indulge inordinate desire.
   [1913 Webster]

         Which [money] while some coveted after, they have erred
         from the faith.                          --1 Tim. vi.
                                                  10.
   [1913 Webster]

WordNet (r) 3.0 (2006):

covet
    v 1: wish, long, or crave for (something, especially the
         property of another person); "She covets her sister's
         house"

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "covet":
   aspire after, begrudge, cast envious eyes, choose, crave,
   crave after, crawl after, desiderate, envy, grudge, hanker after,
   hunger after, lust after, pant after, run mad after, thirst after,
   want, wish