Mark Twain is the pen name of Samuel Langhorne Clemens, the renowned American author and humorist. The name originates from riverboat slang on the Mississippi, signaling safe water two fathoms deep. As a proper noun, it denotes the individual and the literary persona, with the emphasis typically on “Mark” (ˈmɑːrk) and a non-stressed “Twain” (tweyn).
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