From WordNet (r) 3.0 (2006) [wn]:
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, 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, officer]
3: a member of a police force; "it was an accident, officer"
[syn: policeman, police officer, 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: officer, ship's officer]
v 1: direct or command as an officer
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
[1913 Webster]
2. To command as an officer; as, veterans from old regiments
officered the recruits.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
[1913 Webster]
2. (U. S. Mil.) Specifically, a commissioned officer, in
distinction from a warrant officer or an enlisted man.
[1913 Webster]
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 guard, prisoners, and
police of the post or camp; abbreviated O. D., OD, or O.
O. D.
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.
[1913 Webster]