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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 ?
He seemed, too, to be making some objections to which the lieutenant replied by formal assurances.
You are the first men I've seen coming this way this morn- ing," said the lieutenant.
The lieutenant, standing motionless, hat in hand, watched him making these evolutions, and, whilst looking at him, grumbled to himself, biting his mustache:
On entering the hut the chief and his lieutenant cast a wistful look at the rafters, laden with venison and buffalo meat.
Four of the twenty were dead, a dozen others were wounded, and Lieutenant D'Arnot was missing.
I knew it," replied a piping voice, and Lieutenant Telyanin, a small officer of the same squadron, entered the room.
The senseless hatred of the lieutenant grew at last into a form of mania.
Therefore Lieutenant Harold Percy Smith-Oldwick flew low toward the west, searching with keen eyes for signs of a Hun army.
However, why, my dear lieutenant, did you honor me by visiting my island?
He saw the black warriors palavering with the sailors from the cruiser, and then he saw a lithe, brown giant talking with Lieutenant D'Arnot and Captain Dufranne.
One is a dark beauty in the prime of womanhood--the wife of First Lieutenant Crayford, of the
Ben Greene, I guess you are right about that," said the lieutenant.