lesson / moral / admonition
Feminine noun. Plural: عِبَرٌ (ʿibar). From عَبَرَ (to cross over) - a lesson is something you 'cross over' from story to meaning. Related: اِعْتِبَارٌ (taking heed).
Quranic stories (qaṣaṣ) are not told for entertainment but for ʿibrah - extracting moral lessons applicable to one's own life.