n. [A-S. læfel, a level, It. livello, livella, Pr. & Pg. livel, nivel, Sp. nivel, Fr. niveau, from Lat. libella, level, water-level, plummet-level, diminutive of libra, balance, water-poise, level.]
1Sense 1. A line or plane, to which, at every point, a vertical or plumb line is at right angles, or which is every where parallel to the surface of still water;—this is the true level, and is a curve, the center of which coincides with the earth’s center.
2Sense 2. An horizontal line or surface; that is, a straight line or surface which is tangent to the surface of a true level at a given point; and hence, parallel to the horizon at that point;—this is the apparent level at the given point.
3Sense 3. A smooth or even line, plane, or surface; an horizontal line or surface.
4Sense 4. Equal elevation with something else; a state of equality.
Providence, for the most part, sets us on a level. Addison.
5Sense 5. Degree of energy, intensity, or attainment; rate; standard.
6Sense 6. Fixed or quiet condition; a position, as free from exaltation or depression; a position of rest. “When merit shall find its level.” F. W. Robertson.
7Sense 7. Rule; plan; scheme.
8Sense 8. The line of direction in which a missive weapon is aimed.
9Sense 9. (Mech.) An instrument by which to find an horizontal line, or adjust something with reference to such a line.
10Sense 10. (Mining.) (a.) An horizontal gallery excavated in a mine at different depths, as ten, twenty, thirty fathoms below the adit. (b.) In some mining regions, as Newcastle, a gutter for water to run in.
11Sense 11. (Gun.) An instrument to determine the highest points of the breech and muzzle of a cannon, when the carriage-wheels stand on uneven ground.
Carpenter's and mason's level, either the plumb-level, or a straight bar of wood, in which is imbedded a small spirit-level. — James's level, an instrument to find the highest points of the breech and muzzle of a cannon; — so called from the inventor. See def. 11. — Plumb-level, one in which the horizontal arm is placed in true position by means of a plummet or plumb-line, to which it is at right angles. — Spirit-level, one in which the adjustment to the horizon depends on the position of a bubble, or small vacant space, in the upper side of a glass tube, which is slightly curved and nearly filled with alcohol or ether. — Surveyor's level, or leveling instrument, a telescope, with a spirit-level attached, and with suitable screws, &c., for accurate adjustment, the whole mounted on a tripod, for use in leveling. — Water-level, an instrument to show the level by means of the surface of water in a trough, or the upright ends of a bent tube.