The Collaborative International Dictionary of English v.0.48:

Jealousy \Jeal"ous*y\, n.; pl. Jealousies. [ F. jalousie. See
   Jealous, and cf. Jalousie.]
   The quality of being jealous; earnest concern or solicitude;
   painful apprehension of rivalship in cases directly affecting
   one's happiness; painful suspicion of the faithfulness of
   husband, wife, or lover.
   [1913 Webster]

         I was jealous for jealousy.              --Zech. viii.
                                                  2.
   [1913 Webster]

         Jealousy is the . . . apprehension of superiority.
                                                  --Shenstone.
   [1913 Webster]

         Whoever had qualities to alarm our jealousy, had
         excellence to deserve our fondness.      --Rambler.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jealousy
    n 1: a feeling of jealous envy (especially of a rival) [syn:
         jealousy, green-eyed monster]
    2: zealous vigilance; "cherish their official political freedom
       with fierce jealousy"-Paul Blanshard

Easton's 1897 Bible Dictionary:

Jealousy
   suspicion of a wife's purity, one of the strongest passions
   (Num. 5:14; Prov. 6:34; Cant. 8:6); also an intense interest for
   another's honour or prosperity (Ps. 79:5; 1 Cor. 10:22; Zech.
   1:14).