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missive

/ˈmɪsɪv/ noun

In Latin: epistola, litterae Wiktionary

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about missive at Wordnik → Where our words come from →

  1. A written message addressed to a person or organization.
    mailed an indignant letter to the editor

Origin

Learned borrowing from Medieval Latin missīvus, from mittō (“to send”).

From Wiktionary, via Kaikki.org (CC BY-SA)