plural of missive

(formal) A written message; a letter, note or memo. / (in the plural, Scotland, law) Letters sent between two parties in which one makes an offer and the other accepts it.

Specially sent; intended or prepared to be sent. / (obsolete) Serving as a missile; intended to be thrown.

An official letter on matters of common interest, sent to members of a church. / A letter from the sovereign addressed to a dean and chapter, naming the person they are to elect bishop.

plural of letter missive