British Dictionary definitions for commissioned officer
a military officer holding a commission, such as Second Lieutenant in the British Army, Acting Sub-Lieutenant in the Royal Navy, Pilot Officer in the Royal Air Force, and officers of all ranks senior to these
An officer of a country's armed services whose rank is confirmed by a government document (a commission). In many countries, including the United States, commissioned officers in the navy are those of the rank of ensign and above, and in the army and air force those of the rank of lieutenant and above.
Commissioned officers are contrasted with enlisted men and women, such as privates, corporals, and sergeants, or ordinary seamen and petty officers.