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Meaning of ne plus ultra*

ne plus ul•tra

Pronunciation: (ne' ploos" ool'trä Eng. nē' plus" ul'tr&schwa, nā'), [key]
— Latin. Latin.
  1. the highest point; acme.
  2. the most intense degree of a quality or state.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.