A level or rank in an organization, profession, or society.
A formation of troops, ships, etc., in diagonal parallel rows.
A line of riders seeking maximum drafting in a crosswind, resulting in a diagonal line across the road.
To form troops into an echelon.
Of a matrix: having 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, giving rise to a stepped appearance in the matrix.
The natural hierarchy of social status and dominance occurring in a group of birds.
The usually informal hierarchy of authority or command, often partial or approximate, as determined by the especially natural propensity for domination of different members of a specific group over each other, such as older brothers and sisters over their younger siblings.