Webster's English Dictionary

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courier

cou.ri.er \'ku.r-e--*r, 'k*r-e--, 'k*-re--\ n [MF courrier, fr. OIt 
   corriere, fr. correre to run, fr. L ] often attrib currere : MESSENGER : as 
    : a member of a diplomatic service entrusted with bearing messages  : an 
   espionage agent transferring secret information  : a runner of contraband  
   : a member of the armed services whose duties include carrying mail, info 
   rmation, or supplies