Webster's English Dictionary

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sacrament

sac.ra.ment \'sak-r*-m*nt\ n [ME sacrement, sacrament, fr. OF & LL; OF, fr. 
   LL sacramentum], fr. L, oath of allegiance, obligation, fr. sacrare to 
   consecrate 1: a formal religious act that is sacred as a sign or symbol of 
   a spiritual  reality; esp : one instituted by Jesus Christ as a means of 
   grace cap  2a: BLESSED SACRAMENT  2b: the elements or action of a sacrament