The Tipiṭaka in Three Languages

Saccavibhaṅgasuttantabhājanīya › Dukkhaariyasacca

Abhidhammapiṭaka · Vibhaṅga · Vol. 35 · Section 146

[146] Therein, what is birth (jāti)? That which is the birth of the various beings in this or that class of beings, their coming to birth, descent [into the womb], production, the manifestation of the aggregates (khandha), the obtaining of the sense bases (āyatana) — this is called birth.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places