nth
or nth plus One, in University slang, means to the
utmost degree. Thus, Cut to the nth means wholly unnoticed by a
friend. The expression is taken from the index of a mathematical
formula, where n stands for any number, and n + 1, one
more than any number.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 More on nth from Fact Monster:
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 Poets on Poetry  What poets have to say about poetryI, too, dislike it—Marianne Moore
