Source : Webster's Revised Unabridged Dictionary (1913)

Officer \Of"fi*cer\, v. t. [imp. & p. p. {Officered}; p. pr. &
   vb. n. {Officering}.]
   1. To furnish with officers; to appoint officers over.
      --Marshall.

   2. To command as an officer; as, veterans from old regiments
      officered the recruits.

Officer \Of"fi*cer\, n. [F. officier. See {Office}, and cf.
   {Official}, n.]
   1. One who holds an office; a person lawfully invested with
      an office, whether civil, military, or ecclesiastical; as,
      a church officer; a police officer; a staff officer. ``I
      am an officer of state.'' --Shak.

   2. (U. S. Mil.) Specifically, a commissioned officer, in
      distinction from a warrant officer.

   {Field officer}, {General officer}, etc. See under {Field},
      {General}. etc.

   {Officer of the day} (Mil.), the officer who, on a given day,
      has charge for that day of the quard, prisoners, and
      police of the post or camp.

   {Officer of the deck}, or {Officer of the watch} (Naut.), the
      officer temporarily in charge on the deck of a vessel,
      esp. a war vessel.

Source : WordNet®

officer
     n 1: any person in the armed services who holds a position of
          authority or command; "an officer is responsible for the
          lives of his men" [syn: {military officer}]
     2: someone who is appointed or elected to an office and who
        holds a position of trust; "he is an officer of the
        court"; "the club elected its officers for the coming
        year" [syn: {officeholder}]
     3: a member of a police force; "it was an accident, officer"
        [syn: {policeman}, {police officer}]
     4: a person authorized to serve in a position of authority on a
        vessel; "he is the officer in charge of the ship's
        engines" [syn: {ship's officer}]

officer
     v : direct or command as an officer