Webster's English Dictionary

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officer

1. of.fi.cer \'o.f-*-s*r, 'a:f-, rapid 'o.f-s*r, 'a:f-\ n [ME, fr. MF 
   officier, fr. ML officiarius, fr. L officium] obs  1a: AGENT  1b: one 
   charged with police duties  2: one who holds an office of trust, authority, 
   or command  3a: one who holds a position of authority or command in the 
   armed forces; (Xspecif : one who holds a commission 3b: the master or any 
   of the mates of a merchant or passenger ship 
2. officer vt 1: to furnish with officers  2: to command or direct as an 
   officer