(archaic) A manner of conveying one's thoughts, a style of communication.
1599, William Shakespeare, Much Ado About Nothing,She told me, not thinking I had been myself, that I was the prince's jester, that I was duller than a great thaw; huddling jest upon jest with such impossible conveyance upon me, that I stood like a man at a mark, with a whole army shooting at me.
1893, Walter Besant, The Ivory Gate Chapter Prologue, Athelstan Arundel walked home all the way, foaming and raging. No omnibus, cab, or conveyance ever built could contain a young man in such a rage. His mother lived at Pembridge Square, which is four good measured miles from Lincoln's Inn.