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WordReference Random House Learner's Dictionary of American English © 2024ech•e•lon /ˈɛʃəˌlɑn/USA pronunciation n. [countable]- a level of command, authority, or rank:the upper echelons of the administration.
- Militarya steplike formation, as of troops, ships, or planes.
WordReference Random House Unabridged Dictionary of American English © 2024ech•e•lon (esh′ə lon′),USA pronunciation n. - a level of command, authority, or rank:the top echelon of city officials.
- Militarya formation of troops, ships, airplanes, etc., in which groups of soldiers or individual vehicles or craft are arranged in parallel lines, each to the right or left of the one in front, so that the whole presents the appearance of steps.
- Militaryone of the groups of a formation so arranged.
- Optics, PhysicsAlso called ech′elon grat′ing. Spectroscopy. a diffraction grating that is used in the resolution of fine structure lines and consists of a series of plates of equal thickness stacked in staircase fashion.
v.t., v.i. - to form in an echelon.
- Latin scāla; see scale3) + -on noun, nominal suffix
- French échelon, origin, originally rung of a ladder, Old French eschelon, equivalent. to esch(i)ele ladder (
- 1790–1800
- 1.See corresponding entry in Unabridged grade, position, rating.
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