'Cliff' definitions:

Definition of 'cliff'

From: WordNet
noun
A steep high face of rock; "he stood on a high cliff overlooking the town"; "a steep drop" [syn: cliff, drop, drop-off]

Definition of 'Cliff'

From: GCIDE
  • Cliff \Cliff\, n. (Mus.) See Clef. [Obs.] [1913 Webster]

Definition of 'Cliff'

From: GCIDE
  • Cliff \Cliff\ (kl[i^]f), n. [AS. clif, cloef; akin to OS. klif, D. klif, klip, Icel. klif, Dan. & G. klippe, Sw. klippa; perh. orig. a climbing place. See Climb.] A high, steep rock; a precipice. [1913 Webster]
  • Cliff swallow (Zool.), a North American swallow (Petrochelidon lunifrons), which builds its nest against cliffs; the eaves swallow. [1913 Webster]