General English


  • noun a group of people of a certain grade in an organisation


  • One within a hierarchy. For example, there may be multiple levels which pertain to the degree of accuracy of instrument calibration, and an echelon would be one such level.

Media Studies

  • noun a global computer surveillance system used by UK and US security services, which intercepts and analyses communications


  • noun a tactical formation in which troops, vehicles or aircraft are deployed in a series of parallel lines, each of which is longer than the one in front
  • noun part of a tactical grouping