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The following 2 entries include the term two-thirds.
two-thirds rule
noun: a political principle requiring that two thirds rather than a simple majority of the members of a politically organized group must concur in order to exercise the power to make decisions binding upon the whole group compare majority rule
two-thirds vote
noun: a vote requiring the concurrence of two-thirds of the members of a politically organized group
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Merriam-Webster unabridged