This is a useful definition I've found for both gate meeting and gate keepers, Ismael:
"Gate: The decision point, often a meeting, at which a management decision is made to allow the product development project to proceed to the next stage, to recycle back into the current stage to better complete some of the tasks, or to terminate. The number of gates varies by company.
Gatekeepers: The group of managers who serve as advisors, decision-makers and resource allocators in a stage-gate process. They use established criteria to review product development projects at each gate. This multifunctional group is generally most visible at these gate meetings."
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