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Noun: decade  'de,keyd
  1. A period of 10 years
    - decennary, decennium
     
  2. The cardinal number that is the sum of nine and one; the base of the decimal system
    - ten, 10, X, tenner

Derived forms: decades

Type of: large integer, period, period of time, time period

Part of: century

Encyclopedia: Decade