1. Adjective.  (not comparable) Being the only one of its kind; unequaled, unparalleled or unmatched.
  2. Adjective.  Of a feature, such that only one holder has it.
  3. Adjective.  (''disputed'') Of a rare quality.
  4. Adjective.  (''disputed'') Unusual.

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This entry was last updated on RefTopia from its source on 3/20/2012.