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n. A rabbi/scholar who makes halachic decisions/rulings.
"That rabbi is a great posek."
"I'd love to do it, but my posek doesn't allow it."
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"A posek is one who paskens (from Yiddish paskn) or gives a pesak (from Hebrew pesak and Yiddish psak, 'decision, judgment, verdict') on a halachic question. The plural poskim or posekim is used primarily to designate the post-Gaonic scholars who collected, arranged, and systematically codified the halachahs ... distinguished from the meforshim..." (Steinmetz)
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