Definition of missive noun from the Oxford Advanced Learner's Dictionary

 

missive

 noun
noun
BrE BrE//ˈmɪsɪv//
 
; NAmE NAmE//ˈmɪsɪv//
 
(formal or humorous)
 
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a letter, especially a long or an official one Word Origin late Middle English (as an adjective, originally in the phrase letter missive): from medieval Latin missivus, from Latin mittere ‘send’. The current sense dates from the early 16th cent.
See the Oxford Advanced American Dictionary entry: missive