One of the mysteries of the English language finally explained.
Pending the assent of the parties involved, or a higher authority; subject to agreement by other parties and (now usually) to finalization of the details.
Relating to or designating a decision, arrangement, etc., made on such a basis; that is subject to agreement by other parties.
Early 18th century; earliest use found in Abel Boyer (?1667–1729), lexicographer and journalist. From post-classical Latin ad referendum pending the assent of the parties involved, subject to agreement from classical Latin ad + referendum.
ad referendum/ˌad rɛfəˈrɛndəm/
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