The Collaborative International Dictionary of English v.0.48:
Nuncio \Nun"ci*o\, n.; pl. Nuncios. [It. nunzio, nuncio, fr.
L. nuncius, nuntius, messenger; perh. akin to novus new, E.
new, and thus, one who brings news. Cf. Announce.]
1. A messenger. [Obs.] --Shak.
2. The permanent official representative of the pope at a
foreign court or seat of government. Distinguished from a
legate a latere, whose mission is temporary in its nature,
or for some special purpose. Nuncios are of higher rank