Definition of unique
1
: being the only one : sole
his unique concern was his own comfort I can't walk away with a unique copy. Suppose I lost it?— Kingsley Amis the unique factorization of a number into prime factors
b
: distinctively characteristic : peculiar sense 1
this is not a condition unique to California— Ronald Reagan
c
: able to be distinguished from all others of its class or type : distinct sense 1
You will see an assortment of digital tags that let the Web site identify your computer as a unique visitor.— Peter H. Lewis
3
: unusual
a very unique ball-point pen we were fairly unique, the sixty of us, in that there wasn't one good mixer in the bunch— J. D. Salinger
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Merriam-Webster unabridged
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Time Traveler for unique
The first known use of unique was in 1601
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