1. aggregation the act of gathering something together
  2. abrogation an official or legal cancellation
  3. abreaction (psychoanalysis) purging of emotional tensions
  4. objurgation rebuking a person harshly
  5. segregation the act of keeping apart
  6. abnegation the denial and rejection of a doctrine or belief
  7. congregation the act of assembling
  8. arrogation seizure by the government
  9. desegregation incorporation of a formerly excluded group into a community
  10. affrication the conversion of a simple stop consonant into an affricate
  11. altercation a noisy quarrel
  12. corrugation the act of shaping into parallel ridges and grooves
  13. deprecation a prayer to avert or remove some evil or disaster
  14. fabrication the act of making a product from raw materials
  15. imprecation the act of calling down a curse that invokes evil
  16. prorogation discontinuation of the meeting without dissolving it
  17. subrogation (law) the act of substituting of one creditor for another
  18. abdication the act of giving up power
  19. irrigation the act of supplying dry land with water by artificial means
  20. obligation the state of being bound to do or pay something

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