The Collaborative International Dictionary of English v.0.48:

Pax \Pax\, n. [L. pax peace. See Peace.]
   1. (Eccl.) The kiss of peace; also, the embrace in the
      sanctuary now substituted for it at High Mass in Roman
      Catholic churches.
      [1913 Webster]

   2. (R. C. Ch.) A tablet or board, on which is a
      representation of Christ, of the Virgin Mary, or of some
      saint and which, in the Mass, was kissed by the priest and
      then by the people, in medi[ae]val times; an osculatory.
      It is still used in communities, confraternities, etc.
      [1913 Webster]

            Kiss the pax, and be quiet like your neighbors.
                                                  --Chapman.
      [1913 Webster]

   3. Friendship, or a friend; -- esp. in the phrases to make
      pax with, to make friends with, to be good pax, to be good
      friends; also, truce; -- used esp. interjectionally. [Eng.
      Schoolboy Slang]
      [Webster 1913 Suppl.]

V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006):

PAX
       Pixel Addressing eXtensions (Intel, RISC, CPU)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006):

PAX
       Portable Archive eXchange (SCO, Unix)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006):

PAX
       Private Automatic eXchange


U.S. Gazetteer (1990):

Pax, WV (town, FIPS 62356)
  Location: 37.90961 N, 81.26388 W
  Population (1990): 167 (84 housing units)
  Area: 0.8 sq km (land), 0.0 sq km (water)

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "pax":
   Agnus Dei, Holy Grail, Host, Pieta, Sanctus bell, Sangraal, accord,
   agape, ark, asperger, asperges, aspergillum, aspersion,
   auricular confession, bambino, bar mitzvah, bas mitzvah, beadroll,
   beads, candle, celebration, censer, cessation of combat, chaplet,
   ciborium, circumcision, confession, confirmation, cross, crucifix,
   cruet, eucharistial, exemption from hostilities, freedom from war,
   harmony, high celebration, holy cross, holy water,
   holy-water sprinkler, icon, incense, incensory, invocation,
   invocation of saints, kiss of peace, lesser litany,
   liberty in tranquillity, litany, love feast, lustration, matzo,
   menorah, mezuzah, mikvah, monstrance, osculatory, ostensorium,
   paschal candle, peace, peacetime, phylacteries, prayer shawl,
   prayer wheel, processional, pyx, reciting the rosary, relics, rood,
   rosary, sacramental, sacred relics, sacring bell, shofar, sukkah,
   tabernacle, tallith, telling of beads, the confessional,
   the confessionary, thurible, urceole, veronica, vigil light,
   votive candle