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echelon
noun
a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
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Pronunciation
ˈɛʃəlɒn
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Meaning
Definitions
noun
a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset
noun
a body of troops arranged in a line
noun
status in a society or organization
“the upper echelon”
In context
Example Sentences
the upper echelon