Dictionary Definition:
Vijānāti [vi+jñā] to have discriminative (dis=vi˚) know- ledge, to recognize, apprehend, ascertain, to become aware of, to understand, notice, perceive, distinguish, learn, know Sn 93 sq., 763; Dh 64, 65; Nd1 442. See also viññāṇa 2a. -- imper. 2nd sg. vijāna Sn 1091 (=ājāna Nd2 565b); Pv iv.55 (=vijānāhi PvA 260); ppr. vijānanto Sn 656, 953; Pv iv.188; PvA 41; and vijānaŋ neg. a˚ ignorant Dh 38, 60; It 103. Pot. 1st sg. (poet.) vijaññaŋ J iii.360 (=vijāneyyaŋ C.); Sn 1065, 1090, 1097 (=jāneyyaŋ Nd2 565a); & vijāniyaŋ Vv 415 (paṭivijjhiŋ C.); 3rd sg. vijañña Sn 253, 316, 967 (cp. Nd1 489). -- ger.vijāniya Mhvs 8, 16; viññāya Sn 232; & viññitvā Vin iv.264. -- aor. (3rd pl.) vijāniŋsu Mhvs 10, 18. -- Pass. viññāyati PvA 197; fut. viññissati Th 1, 703. -- inf. viññātuŋ S iii.134. -- grd. viññātabba (to be understood) VbhA 46; & viññeyya (q. v.). -- pp. viññāta. -- Caus. II. viññāpeti (q. v.).