Etymology
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jealousy (n.)

c. 1200 in reference to sexual possessiveness and suspicion, from Old French jalousie "enthusiasm, love, longing; jealousy" (12c.), from jalos "keen, zealous; avaricious; jealous" (see jealous). Also sometimes in Middle English in a sense "solicitude, carefulness, regard," the connecting notion being "watchfulness." Meaning "zeal, fervor, devotion" is from late 14c.

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Definitions of jealousy

jealousy (n.)
a feeling of jealous envy (especially of a rival);
Synonyms: green-eyed monster
jealousy (n.)
zealous vigilance; "cherish their official political freedom with fierce jealousy"-Paul Blanshard;
From wordnet.princeton.edu