The Collaborative International Dictionary of English v.0.48:

Lama \La"ma\, n. [Tibet. blama (pronounced l[aum]"ma) a chief, a
   high priest.]
   In Tibet, Mongolia, etc., a priest or monk of the belief
   called Lamaism.
   [1913 Webster]

   The Grand Lama, or Dalai Lama [lit., Ocean Lama], the
      supreme pontiff in the lamaistic hierarchy. Until the
      Chinese occupied Tibet he resided in Lhasa, but now (1998)
      is in exile. See Lamaism.
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

Dalai Lama
    n 1: chief lama and once ruler of Tibet [syn: Dalai Lama,
         Grand Lama]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "Dalai Lama":
   Grand Lama, Holy Roman Emperor, Inca, Kaiser, Panchen Lama, ardri,
   bey, bhikku, bonze, cacique, caesar, cham, czar, kaid, khan, lama,
   mikado, negus, padishah, pendragon, pharaoh, poonghie, rig, sachem,
   sagamore, shah, sheikh, shogun, tenno, tycoon