echelon

Noun
  1. Status in a society or organization (synset 113969830)
    "the upper echelon"
    is a type of: position, status - the relative position or standing of things or especially persons in a society
  2. A body of troops arranged in a line (synset 108289273)
    referred to in: armed forces, armed services, military, military machine, war machine - the military forces of a nation
    is a type of: force, military force, military group, military unit - a unit that is part of some military service
  3. A diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset (synset 103268385)
    is a type of: diffraction grating, grating - optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum

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