Webster's English Dictionary

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sergeant

ser.geant \'sa:r-j*nt\ n [ME, servant, attendant, sergeant, fr. OF sergent, 
   serjant, fr. L (Xservient-, serviens, prp. of servire to serve 1: SERGEANT 
   AT ARMS  obs  2: an officer who enforces the judgments of a court or the 
   commands of one  in authority 3: an officer in a police force ranking in 
   the U.S. just below captain or s ometimes lieutenant and in England just 
   below inspector 4: a noncommissioned officer in the army or marine corps 
   ranking above a co rporal and below a staff sergeant; broadly : any of the 
   noncommissioned officers ranking above a corporal in the army and marine 
   corps and above an airman first class in the air force