echelon

English Thesaurus

1. a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset (noun.artifact)

hypernym	:	diffraction grating, grating,
definition	:	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 (noun.artifact)

2. a body of troops arranged in a line (noun.group)

hypernym	:	force, military force, military group, military unit,
definition	:	a unit that is part of some military service (noun.group)

domain category	:	armed forces, armed services, military, military machine, war machine,
definition	:	the military forces of a nation (noun.group)