non-unique

adjective

1. existing as the only one or as the sole example; single; solitary in type or characteristics: a unique copy of an ancient manuscript.
2. having no like or equal; unparalleled; incomparable: Bach was unique in his handling of counterpoint.
3. limited in occurrence to a given class, situation, or area: a species unique to Australia.
4. limited to a single outcome or result; without alternative possibilities: Certain types of problems have unique solutions.
5. not typical; unusual: She has a very unique smile.

noun

6. the embodiment of unique characteristics; the only specimen of a given kind: The unique is also the improbable.

adjective

1. being the only one of a particular type; single; sole
2. without equal or like; unparalleled
3. informal very remarkable or unusual
4. maths
   1. leading to only one resultthe sum of two integers is unique
   2. 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.