- existing as the only one or as the sole example; single; solitary in type or characteristics: a unique copy of an ancient manuscript.
- having no like or equal; unparalleled; incomparable: Bach was unique in his handling of counterpoint.
- limited in occurrence to a given class, situation, or area: a species unique to Australia.
- limited to a single outcome or result; without alternative possibilities: Certain types of problems have unique solutions.
- not typical; unusual: She has a very unique smile.
- the embodiment of unique characteristics; the only specimen of a given kind: The unique is also the improbable.
- being the only one of a particular type; single; sole
- without equal or like; unparalleled
- informal very remarkable or unusual
- leading to only one resultthe sum of two integers is unique
- having precisely one valuethe unique positive square root of 4 is 2
adj.c.1600, “single, solitary,” from French unique, from Latin unicus “single, sole,” from unus “one” (see one). Meaning “forming the only one of its kind” is attested from 1610s; erroneous sense of “remarkable, uncommon” is attested from mid-19c.