What is the meaning of unique?

adjective

• Radically distinctive and without equal.
  • usage: "he is alone in the field of microbiology"; "this theory is altogether alone in its penetration of the problem"; "Bach was unique in his handling of counterpoint"; "craftsmen whose skill is unequaled"; "unparalleled athletic ability"; "a breakdown of law unparalleled in our history"
  • synonyms: alone, unequaled, unequalled, unparalleled
• Followed by `to'. ( applying exclusively to a given category or condition or locality)
  • usage: "a species unique to Australia"
• The single one of its kind.
  • usage: "a singular example"; "the unique existing example of Donne's handwriting"; "a unique copy of an ancient manuscript"; "certain types of problems have unique solutions"
  • synonyms: singular
• Highly unusual or rare but not the single instance.
  • usage: "spoke with a unique accent"; "had unique ability in raising funds"; "a frankness unique in literature"; "a unique dining experience"