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\ ˈpaks 
, ˈpäks \
, ˈpäks \Definition of pax
1 : a tablet decorated with a sacred figure (as of Christ) and sometimes ceremonially kissed by participants at mass
2 : the kiss of peace in the Mass
3 : peace especially, capitalized : a period of general stability in international affairs under the influence of dominant military power —usually used in combination with a latinized name Pax Americana
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The first known use of pax was in the 14th century
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