Sotāpattiyaṅga: the 4 (preliminary) 'conditions to Stream-entry' are: companionship with good persons, hearing the Good Law, wise reflection, living in conformity with the Law (S. LV, 5; D. 33). Cf. Sotāpannassa aṅgāni.

Buddhist Dictionary, Manual of Buddhist Terms and Doctrines, by NYANATILOKA MAHATHERA