What is Bailiff?

Legal Definition
A bailiff (from Middle English baillif, Old French baillis, bail "custody, charge, office"; cf. bail, based on the adjectival form, baiulivus, of Latin bajulus, carrier, manager) is a manager, overseer or custodian; a legal officer to whom some degree of authority or jurisdiction is given. Bailiffs are of various kinds and their offices and duties vary greatly.

Another official sometimes referred to as a bailiff was the vogt: see Vogt and Vogt (Switzerland). In the Holy Roman Empire a similar function was performed by the Amtmann.
-- Wikipedia
Legal Definition
Account render. A bailiff is a person who has, by delivery, the custody and administration of lands or goods for the benefit of the owner or bailor, and is liable to render an account thereof. Co. Lit. 271; 2 Leon. 245; 1 Mall . Ent. 65. The word is derived from the old French word bailler, to bail, that is, to deliver. Originally, the word implied the delivery of real estate, as of land, woods, a house, a part of the fish in a pond; Owen, 20; 2 Leon. 194; Keilw. 114 a, b; 37 Ed. III. 7; 10 H. VII. 7, 30; but was afterwards extended to goods and chattels. Every bailiff is a ,receiver, but every receiver is not a bailiff. Hence it is a good plea that the defendant never was receiver, but as bailiff. 18 Ed. III. 16. See Cro. Eliz. 82-3; 2 Anders. 62-3, 96-7 F. N. B. 134 F; 8 Co. 48 a, b.

2. From a bailiff is required administration, care, management, skill. He is, therefore, entitled to allowance for the expense of administration, and for all things done in his office, according to his own judgment, without the special direction of his principal, and also for casual things done in the common course of business: 1 Mall. Ent. 65, (4) 11; 1 Rolle, Ab. 125, 1, 7; Co. Lit. 89 a; Com. Dig. E 12 Bro. Ab. Acc. 18 Lucas, Rep. 23 but not for things foreign to his office. Bro. Ab. Acc .26, 88; Plowd. 282b, 14; Com. Dig. Acc. E13; Co. Lit. 172; 1 Mall. Ent. 65, (4) 4. Whereas, a mere receiver, or a receiver who is not also a bailiff, is not entitled to allowance for any expenses. Bro. Ab. Acc. 18; 1 Mall. Ent. 66, (4) 10; 1 Roll. Ab. 118; Com. Dig. E 13; 1 Dall. 340.

3. A bailiff may appear and plead for his principal in an assize; " and his plea com- mences " thus, " J. S., bailiff of T. N., comes " &c., not " T. N., by his bailiff, J. S., comes," &c. 2 Inst. 415; Keilw. 117 b. As to what matters he may plead, see 2 Inst. 414.
-- Bouviers Law Dictionary
Legal Definition
Office. Magistrates who for merly administered justice in the parliaments or courts of France, answering to the English sheriffs as mentioned by Bracton. There are still bailiffs of particular towns in England as the bailiff of Dover Castle, &c., otherwise bailiffs are now only officers or stewards, &c. as Bailiffs of liberties, appointed by every lord within his liberty, to serve writs, &c. Bailiff errent or itenerant, appointed to go about the country for the same purpose. Sheriff 's bailies, sheriff's officers to execute writs; these are also called bound bailiffs because they are usually bound in a bond to the sheriff for the due exeecution of their office. Bailiffs of court baron, to summon the court, &c. Bailffs of husbandry, appointed by private persons to collect their rents and manage their estates. Water bailiffs, officers in port towns for searching ships, gathering tolls, &c. Bac. Ab. h. t.
-- Bouviers Law Dictionary
Legal Definition
In a general sense, a person to whom some authority, care, guardianship or jurisdiction is delivered, committed or entrusted; one who is deputed or appointed to take charge of another's affairs; an overseer or superintendent; a keeper, protector or guardian; a steward. Spelman. A sheriff's officer or deputy. 1 Bl. Comm. 344. A magistrate, who formerly administered Justice in the parliaments or courts of France, answering to the English sheriffs as mentioned by Bracton. In the action of account render. A person who has by delivery the custody and administration of lands or goods for the benefit of the owner or bailor, and ls liable to render an account thereof. Co. Litt. 271; Story, Eq. Jur. § 446; West v. Weyer, 46 Ohio St. 66, 18 N. E. 537, 15 Am. St. Rep. 552.

A bailiff is defined to be "a servant that has the administration and charge of lands, goods, and chattels, to make the best benefit for the owner, against whom an action of account lies, for the profits which he has raised or made, or might by his industry or care have raised or made." Barnum v. London, 25 Conn. 149. -Bailiff-errant. A bailiff's deputy. See Bailiffs of franchises.
-- Black's Law Dictionary
Legal Definition
A sheriff’s deputy-; a keeper.
-- Ballentine's Law Dictionary