privy [family]
Formal/legal. "Privy to" + information = aware of (often secret information). From Old French "privé" (private).
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sharing knowledge of something secret
Only a few were privy to the decision.
In UK: formal body advising the monarch, mostly ceremonial today. Historical equivalents in many monarchies.
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a body of advisers to the British monarch
The bill was approved by the Privy Council.














