Ugghatitaññu: 'one who already during a given explanation comes to penetrate the truth' Pug.. This is one of four types of persons classified according to their ability of acquiring insight, mentioned in A. IV, 133. Cf. also vipacitaññū, neyya, pada-parama See The Requisites of Enlightenment, by Ledi Sayadaw WHEEL 171/174 p. 1ff.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.