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The Collaborative International Dictionary of English v.0.48 (gcide)

Echelon \Ech"e*lon\ ([e^]sh"e*l[o^]n), n. [F., fr. ['e]chelle
ladder, fr. L. scala.]
1. (Mil.) An arrangement of a body of troops when its
divisions are drawn up in parallel lines each to the right
or the left of the one in advance of it, like the steps of
a ladder in position for climbing. Also used adjectively;
as, echelon distance. --Upton (Tactics).
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2. (Naval) An arrangement of a fleet in a wedge or V form.
--Encyc. Dict.
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{Echelon lens} (Optics), a large lens constructed in several
parts or layers, extending in a succession of annular
rings beyond the central lens; -- used in lighthouses.
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Echelon \Ech"e*lon\, v. t. (Mil.)
To place in echelon; to station divisions of troops in
echelon.
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Echelon \Ech"e*lon\, v. i.
To take position in echelon.
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Change direction to the left, echelon by battalion from
the right. --Upton
(Tactics).
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