"unique" in the adjective sense

1. alone, unique, unequaled, unequalled, unparalleled

radically distinctive and without equal

"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"

2. unique

followed by `to') applying exclusively to a given category or condition or locality

"a species unique to Australia"

3. singular, unique

the single one of its kind

"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"

4. unique

highly unusual or rare but not the single instance

"spoke with a unique accent"

"had unique ability in raising funds"

"a frankness unique in literature"

"a unique dining experience"

Source: WordNet® (An amazing lexical database of English)

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