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extension

extension - noun

  1. The act of making something longer or the condition of being made longer: elongation, prolongation, protraction. See long.
  2. The act of increasing in dimensions, scope, or inclusiveness: enlargement, expansion, spread. See increase.
  3. An area within which something or someone exists, acts, or has influence or power: ambit, compass, extent, orbit, purview, range, reach, realm, scope, sphere, sweep, swing. See territory.
  4. A part added to a main structure: annexe, arm, wing. See part.