60 senators settng a time-limit
The word 'cloture' has a couple of meanings: 1: terminate debate by calling for a vote; 2: a rule for limiting or ending debate in a deliberative body
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It is is a motion or process aimed at bringing debate to a quick end, and is used to prevent a fillibust.
d. ends a filibuster.
60 senators (3/5 of Senate) must agree to a cloture to end a filibuster.