Meaning in this text
The divine descent — the incarnation of Vishnu into the world whenever dharma declines. The Bhagavatam describes the Dashavatara (ten principal avatars) in Skandha 1 and devotes full skandhas to individual avatars including Kapila (Sk. 3), Narasimha (Sk. 7), and Rama (Sk. 9).
On this site, Avatara is treated as a reading aid rather than a final doctrinal definition: use it to move from a question about a term into the chapters where the term actually appears.