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from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Indicates a pause or omission; an ellipsis.
• noun Internet slang, text messaging A response used to express annoyance, shock or confusion.
• noun mathematics In a sequence of numbers, omits numbers, when the pattern to be followed is clear.
• noun mathematics Indicates that the an indefinite sequence of digits of an irrational number follows.