Meaning of jealousy

jeal•ous•y

1. jealous resentment against a rival, a person enjoying success or advantage, etc., or against another's success or advantage itself.
2. mental uneasiness from suspicion or fear of rivalry, unfaithfulness, etc., as in love or aims.
3. vigilance in maintaining or guarding something.
4. a jealous feeling, disposition, state, or mood.