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Physics a type of diffraction grating used in spectroscopy consisting of a series of plates of equal thickness arranged stepwise with a constant offset
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(Russian, eshelon), in Soviet military usage:

(1) A unit within the battle or operational arrangement of a body of troops. A battle formation or the operational arrangement of a front’s or any army’s forces may consist of one echelon or of several echelons arranged one behind another.

(2) A distinct grouping of personnel being moved by rail, water, or air. In this sense, an echelon may be a troop train, a motor-vehicle convoy, or a group of aircraft or surface ships.

(3) In military strategy, the part of a country’s armed forces that is deployed while mobilization is taking place in a critical period, at the very outset of a war, or in the course of military actions.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A formation of troops; the units are parallel but unaligned, in a steplike manner.
A similar arrangement of planes or ships, as planes flying in a V formation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


i. An arrangement of aircraft flying a formation in which each flies at a level above or below another aircraft in the formation and usually at a distance to the right or the left. Aircraft are said to be in the echelon port or the star-board, depending on which side of the leader they are on.
ii. A level of maintenance service, such as first echelon maintenance, fourth echelon maintenance, etc.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
- Retail space featuring the Echelon bike, clothing and other fitness items
The FT 6000 EVK follows Echelon's January 2014 announcement of the multiprotocol FT 6050 IzoT-enabled SoC, a single- chip solution for providing reliable, cost-effective, flexible wired IP connectivity for creating communities of devices in the IIoT.
An Insolvency Service report lays bare Alexander's last-ditch bid to keep Echelon afloat by taking cash from one client to buy off another.
EES will introduce the new Echelon Flex 45 Endopath 45mm Stapler, which is already available with a 60mm staple line, at the Society of American Gastrointestinal and Endoscopic Surgeons' (SAGES) 12th World Congress of Endoscopic Surgery.
Willis F Chapman brigadier general Comdr 1st Echelon 1st Lt.
Chris Richardson, managing director of Cheveley Park Stud, said: "All being well, Echelon and Nannina could both run in the Sun Chariot, with our other entry Heaven Sent probably going for the Joel Stakes.
Cesare's jockey Jamie Spencer is in pole position to take Moore's title this time, but while he brought Cesare with a powerful challenge all through the final furlong, Moore had the last laugh as Echelon would not give in.
The Echelon Condominium, rising 12 stories above a double-height lobby, is located at 13-11 Jackson Avenue in the heart of the burgeoning area.
Echelon's PI3-K competitive assay patent exemplifies Echelon's unique leadership role with scientists investigating PI3-K as a therapeutic target for drug development.
This problem statement also effectively bounded the problem by limiting the effort to the ground force, focusing on C2 and SA exchange at the tactical echelon and establishing schedule as a driver.
The product, Echelon DSP, is offered by Echelon Marketing Group of McLean, Va., a division of IXI Corp.
They come from the European Union (EU), in its 194-page landmark report of 11 July 2001 "on the existence of a global system for the interception of private and commercial communications (ECHELON interception system)".