missive

missive is an   Adverb

Definition:

[1] Specially sent; intended or prepared to be sent; as, a letter missive. Ayliffe.

[2] Missile. "The missive weapons fly." Dryden. Letters missive, letters conveying the permission, comand, or advice of a superior authority, as a sovereign. They are addressed and sent to some certain person or persons, and are distinguished from letters patent, which are addressed to the public.

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