plural of rear echelon

(military) That part of an army that is not needed to directly combat the enemy. / (military, by extension) The administrative and supply departments of an army.

A large lens constructed in several parts or layers, extending in a series of annular rings beyond the central lens, and used in lighthouses.

plural of echelon lens

(UK) Synonym of angle parking

(linear algebra) row echelon form / (linear algebra) column echelon form

(nautical, military, of wing-mounted gun turrets on a warship) Staggered; offset so that the wing turret on one side is mounted further forwards than the one on the opposite side.

(linear algebra) The stepped appearance of a matrix that has undergone Gaussian elimination with the result that the leading coefficient or pivot (that is, the first nonzero number from the left) of a nonzero row is to the right of the pivot of the row above it.

(linear algebra) The transpose of the row echelon form of the transpose of a given matrix.

plural of row echelon form