Grammatical Analysis
Āyusaṅkhāra: [m.] vital formation; life-span; the karmic energy sustaining life. Formed by āyu (life, lifespan, age) + saṅkhāra (formation, constructed energy).
Orthodox Definition
Āyusaṅkhāra refers to the specific, finite quantum of karmic energy that determines the maximum length of a sentient being’s lifespan in a particular rebirth.
When a being is reborn, their past reproductive kamma (janaka-kamma) establishes an āyusaṅkhāra—a sort of biological and karmic “battery.” Biological death (maraṇa) occurs when this karmic battery runs out, when the natural lifespan of the realm is reached, or when a sudden, destructive kamma (upacchedaka-kamma) prematurely shatters the vital formations.
The term appears most famously in the Mahāparinibbāna Sutta. Three months before his passing, the Buddha formally relinquished his āyusaṅkhāra (vital formations), making the deliberate, supramundane decision to allow his physical body to expire, causing a massive earthquake.
Textual References
- Sutta: Mahāparinibbāna Sutta (DN 16) – The dramatic turning point of the text where the Tathāgata suppresses the life-sustaining forces and accepts his impending Parinibbāna.
- Canonical: Samyutta Nikaya (Āyu Sutta - SN 15.20) – Reflecting on the brevity and fragility of the human lifespan.
- Commentary: Sumaṅgalavilāsinī – Detailed exegesis explaining how a Buddha uses concentration (samādhi) to temporarily extend or permanently relinquish his vital formations.