The Collaborative International Dictionary of English v.0.48:

Padre \Pa"dre\ (p[aum]"dr[=a]), n.; pl. Sp. & Pg. Padres
   (p[aum]"dr[=a]s); It. Padri (p[aum]"dr[=e]). [Sp., Pg., &
   It., fr. L. pater father. See Father.]
   1. A Christian priest or monk; used as a term of address for
      priests in some churches (especially Roman or Orthodox
      Catholic in Italy, Spain, Portugal, and Spanish America);
      -- also used in the American military.

   Syn: Father.
        [Webster 1913 Suppl.]

   2. In India (from the Portuguese), any Christian minister;
      also, a priest of the native region. --Kipling.
      [Webster 1913 Suppl.]

   3. A chaplain in one of the military services.

   Syn: military chaplain, Holy Joe, sky pilot.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

padre
    n 1: a chaplain in one of the military services [syn: military
         chaplain, padre, Holy Joe, sky pilot]
    2: `Father' is a term of address for priests in some churches
       (especially the Roman Catholic Church or the Orthodox
       Catholic Church); `Padre' is frequently used in the military
       [syn: Father, Padre]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "padre":
   DD, Doctor of Divinity, Holy Joe, abbe, cassock, chaplain,
   churchman, clergyman, cleric, clerical, clerk, confessor, curate,
   cure, divine, ecclesiastic, father, father confessor,
   father in Christ, gallach, man of God, military chaplain, minister,
   parish priest, parson, pastor, penitentiary, presbyter, priest,
   rector, reverend, servant of God, shepherd, sky pilot,
   spiritual director, spiritual father, supply clergy,
   supply minister, the Reverend, the very Reverend,
   tonsured cleric