From The Collaborative International Dictionary of English v.0.48 [gcide]: Rilievo \Ri*lie"vo\, n.[It. See Relief.] (Sculp. & Arch.) Same as Relief, n., 5. [1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
rilievo
n 1: sculpture consisting of shapes carved on a surface so as to
stand out from the surrounding background [syn: relief,
relievo, rilievo, embossment, sculptural relief]