1. A body of troops arranged in a line 
2. 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 Echelon, NJ Echelon, New Jersey

• larger-than-life
• largess
• flux
• flux applicator
• flux density
• flux density unit
• flux unit
• fluxing lime
• fluxion
• fluxional
• fluxmeter
• fly
• fly agaric
• fly ash
• fly ball
• fly blind
• fly casting
• fly contact
• fly floor
• fly front
• fly gallery
• fly high
• fly honeysuckle
• fly in the face of
• fly in the ointment