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Noun: echelon  'e-shu,lón
  1. A level or rank in an organization, profession, or society
    "the lower echelons of society"
  2. (military) a body of troops arranged in a line
  3. A diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset

Derived forms: echelons

Type of: diffraction grating, force, grating, military force, military group, military unit

Encyclopedia: Echelon, New Jersey