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See: coadjutant, deputy, liaison, plenipotentiary, proctor, procurator, proxy, substitute

LIEUTENANT. This word has now a narrower meaning than it formerly had; its true meaning is a deputy, a substitute, from the French lieu, (place or post) and tenant (holder). Among civil officers we have lieutenant governors, who in certain cases perform the duties of governors; (vide, the names of the several states,) lieutenants of police, &c. Among military men, lieutenant general was formerly the title of a commanding general, but now it signifies the degree above major general. Lieutenant colonel, is the officer between the colonel and the major. Lieutenant simply signifies the officer next below a captain. In the navy, a lieutenant is the second officer next in command to the captain of a ship.

References in classic literature ?
They have been gone ten days," said Lieutenant Bronsfield at last.
They have arrived, lieutenant," exclaimed a young midshipman, "and they are doing what all travelers do when they arrive in a new country, taking a walk
I am sure of that, if you tell me so, my young friend," said Lieutenant Bronsfield, smiling.
I should like to believe it," replied the lieutenant, who was quite unmoved.
Fentolin," Lieutenant Godfrey shouted, "and many thanks.
The silent ranks were suddenly thrilled by the eager voice of the youthful lieutenant bawling out: "Here they come
The youth's eyes had instantly turned in the direction indicated by the awakened and agitated lieutenant, and he had seen the haze of treachery disclosing a body of soldiers of the enemy.
These troops had apparently been going for- ward with caution, their rifles held in readiness, when the youthful lieutenant had discovered them and their movement had been interrupted by the volley from the blue regiment.
For two or three minutes they circled about him until, at a word from Numabo, they closed in simultaneously, and though the slender young lieutenant struck out to right and left, he was soon overwhelmed by superior numbers and beaten down by the hafts of spears in brawny hands.
As the guard prodded him along the narrow trail, Lieutenant Smith-Oldwick could not but wonder why they had wished to take him alive.
As the warriors pushed the crowd back, opening a space through which the white man was led toward a hut, Lieutenant Smith-Oldwick saw coming from the opposite end of the village a number of Negroes wearing odds and ends of German uniforms.
The lieutenant returned his civility, commended his resolution, shook him by the hand, and invited him to dine with himself and the rest of the officers.