MISSIVE
Source: 566, 567
missive. Missive, a. such as may be sent, thrown or shot
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Mis″sive (?), a. [[See Missive, n.]] 1. 1. Specially sent; intended or prepared to be sent; as, a letter missive. Ayliffe.
2. 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.