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Meaning of supermajority

su•per•ma•jor•i•ty

Pronunciation: (s'pur-mu-jôr"i-tē, -jor"-), [key]
— -ties.
  1. a majority that must represent some percentage more than a simple majority.
  2. a majority greater than a specified number, as 60%, of the total: required to pass certain types of legislation, override vetos, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.