Echelon

What is Echelon ?

Echelon is (noun) 1. a group of people at a certain level in an organisation the upper echelons of management the lower echelons of village society 2. an arrangement of separate things in steps, each behind the other and to one side, and not in a straight line The tanks moved forward in echelon.

 

source: Easier English, Student Dictionary Upper Intermediate Level