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Adjective: one-of-a-kind  ,wún-u-vu'kInd
  1. The single one of its kind
    "The museum displayed a one-of-a-kind diamond necklace";
    - singular, unique
     
  2. Radically distinctive and without equal
    "he is one-of-a-kind in the field of microbiology";
    - alone, unique, unequaled [US], unequalled [Brit, Cdn], unparalleled

See also: incomparable, single, uncomparable

Encyclopedia: One-of-a-kind