The Collaborative International Dictionary of English v.0.48:

Immolate \Im"mo*late\, v. t. [imp. & p. p. Immolated; p. pr. &
   vb. n. Immolating.] [L. immolatus, p. p. of immolare to
   sacrifice, orig., to sprinkle a victim with sacrifical meal;
   pref. im- in + mola grits or grains of spelt coarsely ground
   and mixed with salt; also, mill. See Molar, Meal ground
   grain.]
   1. To sacrifice; to offer in sacrifice; to kill, as a
      sacrificial victim.
      [1913 Webster]

            Worshipers, who not only immolate to them [the
            deities] the lives of men, but . . . the virtue and
            honor of women.                       --Boyle.
      [1913 Webster]

   2. To destroy by fire.
      [PJC]

WordNet (r) 3.0 (2006):

immolate
    v 1: offer as a sacrifice by killing or by giving up to
         destruction; "The Aztecs immolated human victims";
         "immolate the valuables at the temple"

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "immolate":
   annihilate, appease, bereave of life, carry away, carry off,
   chloroform, cut down, cut off, deprive of life, destroy, dispatch,
   dispose of, do away with, do for, do to death, end, execute,
   exterminate, finish, finish off, immolate before, kill,
   launch into eternity, liquidate, lynch, make away with,
   make propitiation, make sacrifice to, martyr, martyrize,
   offer sacrifice, poison, propitiate, purge, put away, put down,
   put to death, put to sleep, remove from life, sacrifice, slay,
   starve, take life, take off, victimize