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From 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]