• In <em>mathematics</em>, unambiguous and singly determinate.
  • Only; single.
  • Having no like or equal; unmatched; sole; unequaled; single in its kind or excellence: often used relatively, and then signifying rare, unusual.
  • A unique thing; a thing unparalleled or sole of its kind.
  • A thing without a like; something unequaled or unparalleled.
  • Being without a like or equal; unmatched; unequaled; unparalleled; single in kind or excellence; sole.
  • Being the only one of its <xref>kind</xref>; <xref>unequaled</xref>, <xref>unparalleled</xref> or <xref>unmatched</xref>.
  • Of a feature, such that only one holder has it.
  • Of a <xref>rare</xref> <xref>quality</xref>.
  • <xref>Unusual</xref>.
  • A thing without a like; something unequalled or unparallelled.
  • the single one of its kind
  • highly unusual or rare but not the single instance
  • radically distinctive and without equal
  • (followed by `to') applying exclusively to a given category or condition or locality
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