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]