echelon, n.
(echelons)
(echelons)
a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
<noun.artifact>
echelon
semantic pointers
hypernym
a body of troops arranged in a line
<noun.group>
echelon
semantic pointers
hypernym
domain of synset (topic)
status in a society or organization
<noun.state>
echelon