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Next after the second; coming after two others; -- the ordinal of three; as, the thirdhour in the day. "The third night." Chaucer.

The third rail used in the third-rail system.

An under constable. Shak. Johnson.

A third part of the profits of fines and penalties imposed at the country court, which was among the perquisites enjoyed by the earl.

A system in which a third rail is used for carrying the current for operating the motors, the rail being insulated from the ground and the current being taken off by means of contact brushes or other devices.

The third part of the corn or grain growing on the ground at the tenant's death, due to the lord for a heriot, as within the manor of Turfat in Herefordshire.

In the third place. Bacon.

The fourth or digestive stomach of a ruminant, which leads from the third stomach omasum. See Ruminantia.

o-morrow, about this time." Exod. ix. 18. "About my stature." Shak. He went out about the third hour. Matt. xx. 3.

A regularly recurring stress upon the tone to mark the beginning, and, more feebly, the third part of the measure.

A method of electing a pope by the expression of homage from two thirds of the conclave. [Pole] might have been chosen on the spot by adoration. Froude.

lligation. -- Alternate angles (Geom.), the internal and angles made by two lines with a third, on opposite sides of it. It the parallels AB, CD, are cut by the line EF, the angles AGH, GHD, as also the angles BGH and GHC, are called alternate angles. -- Alternate generation. (Biol.) See under Generation.…

A poem in which persons are represented at speaking alternately; as the third and seventh eclogues of Virgil.

The first of the two terms of a ratio; the first or third of the four terms of a proportion. In the ratio a:b, a is the antecedent, and b the consequent.

the Hebrews, the Epistles of James and Jude, the second Epistle of Peter, the second and third Epistles of John, and the Revelation. The undisputed books are called the Homologoumena.

A foot of four syllables, the first and fourth short, and the second and third long.

stians, and particularly to the ceremonies and discipline of the church in the second and third centuries. -- Apostolic church, the Christian church; -- so called on account of its apostolic foundation, doctrine, and order. The churches of Rome, Alexandria, Antioch, and Jerusalem were called apostolic churches. -- Ap…

son or thing, absent or present; as, Milton's apostrophe to Light at the beginning of the third book of "Paradise Lost."

A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain.

and instraction, who are variously called home reserves (as in the table below), second, third, etc., line of defense (the regular army and its reserves ordinarily constituting the first line of defense), territorial forces, or the like. In countries where conscription prevails a soldier is supposed to serve a given n…