Dictionary Definition:
Āmantana (nt.) & ˚nā (f., also ˚ṇā) [from āmanteti] ad- dressing, calling; invitation, greeting Sn 40 (ep. Nd2 128); ˚vacana the address -- form of speech i. e. the vocative case (cp. Sk. āmantritaŋ id.) SnA 435; KhA 167.