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 Bernard
, and Saint Gotthard
are important; in the Caucasus, Daryal
is traversed by a great military road; in Asia, Khyber Pass
into India and the passes of the Himalayas, Karakorum
, and other ranges are important.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
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.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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.
A complete cycle of reading, processing, and writing in a computer.
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.
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.
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.
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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
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)
a variant of pase
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005