Being without a like or equal; unmatched; unequaled; unparalleled; single in kind or excellence; sole.
- Being the only one of its kind: the unique existing example of Donne's handwriting.
- Without an equal or equivalent; unparalleled.
- Characteristic of a particular category, condition, or locality: a problem unique to coastal areas.
- Informal Unusual; extraordinary: spoke with a unique accent.