from
The Collaborative International Dictionary of English v.0.48
Missive \Mis"sive\, a. [See {Missive}, n.]
1. Specially sent; intended or prepared to be sent; as, a
letter missive. --Ayliffe.
[1913 Webster]
2. Missile. "The missive weapons fly." --Dryden.
[1913 Webster]
{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.
[1913 Webster]