pass

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pass,

opening or way by which a natural or artificial barrier can be crossed. The term pass is usually applied to a relatively narrow passage through a mountainous region. A pass, like an isthmus, may have great strategic and economic importance; the history of a nation has often been determined by its success or failure in defending a pass, and land trade routes must necessarily cross passes. In the Alps, Saint BernardSaint Bernard,
two Alpine passes, both used since antiquity. The Great Saint Bernard (alt. 8,110 ft/2,472 m), on the Italian-Swiss border, links Valais canton, Switzerland, with Valle d'Aosta, Italy.
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, SimplonSimplon
, pass, 6,590 ft (2,009 m) high, in the Lepontine Alps, Valais canton, S Switzerland. It is crossed by the Simplon Road built (1800–1806) by Napoleon I.
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, and Saint GotthardSaint Gotthard
, mountain group of the Lepontine Alps, S central Switzerland, rising to Pizzo Rotondo (10,472 ft/3,192 m high). The Reuss, Rhine, Ticino, and Rhône rivers rise there. It is crossed by the Saint Gotthard Pass, 6,935 ft (2,114 m) high.
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 are important; in the Caucasus, DaryalDaryal
or Dariel
, pass, c.3,950 ft (1,204 m) high, N Georgia, in the central Greater Caucasus Mts. below Mt. Kazbek. Situated above the Terek River, it is noted for its wild grandeur.
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 is traversed by a great military road; in Asia, Khyber PassKhyber Pass
, narrow, steep-sided pass, 28 mi (45 km) long, winding through the Safed Koh Mts., on the Pakistan-Afghanistan border; highest point is 3,500 ft (1,067 m). The routes through it link the cities of Peshawar, Pakistan, and Kabul, Afghanistan.
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 into India and the passes of the Himalayas, KarakorumKarakorum
or Karakoram,
mountain range, extending c.300 mi (480 km), between the Indus and Yarkant rivers, N Kashmir, S central Asia; SE extension of the Hindu Kush. It covers disputed territory, held by China on the north, India on the east, and Pakistan on the west.
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, and other ranges are important.

Pass

 

a gap formed by the grooves of two coupled rolls through which the metal to be reduced is passed in order to give it the required shape.

A distinction is made between reducing, roughing, and finishing passes. Reducing passes serve to reduce the cross section of the initial stock without significant alteration of its shape; roughing passes are used to produce rolled metal with a cross section close to that of the finishing stage; and finishing passes are used to give the metal its final shape and dimensions.

pass

[pas]
(aerospace engineering)
A single circuit of the earth made by a satellite; it starts at the time the satellite crosses the equator from the Southern Hemisphere into the Northern Hemisphere.
The period of time in which a satellite is within telemetry range of a data acquisition station.
(computer science)
A complete cycle of reading, processing, and writing in a computer.
(geography)
A natural break, depression, or other low place providing a passage through high terrain, such as a mountain range.
A navigable channel leading to a harbor or river.
A narrow opening through a barrier reef, atoll, or sand bar.
(mechanical engineering)
The number of times that combustion gases are exposed to heat transfer surfaces in boilers (that is, single-pass, double-pass, and so on).
In metal rolling, the passage in one direction of metal deformed between rolls.
In metal cutting, transit of a metal cutting tool past the workpiece with a fixed tool setting.
(metallurgy)
Passage of a metal bar between rolls.
Open space between two grooved rolls through which metal is processed.
Weld metal deposited in one trip along the axis of a weld.
(mining engineering)
A mine opening through which coal or ore is delivered from a higher to a lower level.
A passage left in old workings for workers to travel as they move from one level to another.
A treatment of the whole ore sample in a sample divider.
A passage of an excavation or grading machine.
In surface mining, a complete excavator cycle in removing overburden.

pass

A single progression of a welding operation along a joint, resulting in a weld bead.

PASS.

On drawings, abbr. for “passenger.”

pass

1. a route through a range of mountains where the summit is lower or where there is a gap between peaks
2. a way through any difficult region
3. a permit, licence, or authorization to do something without restriction
4. Brit
a. the passing of a college or university examination to a satisfactory standard but not as high as honours
b. (as modifier): a pass degree
5. a dive, sweep, or bombing or landing run by an aircraft
6. a motion of the hand or of a wand as a prelude to or part of a conjuring trick
7. Sport the transfer of a ball from one player to another
8. Fencing a thrust or lunge with a sword
9. Bridge the act of passing (making no bid)
10. Bullfighting a variant of pase