That which is totally unconditioned, unrestricted, pure, perfect, or complete; that which can be thought of without relation to others.
A thing without a like; something unequalled or unparallelled; one of a kind.
Of a rare quality, unusual.
Being the only one of its kind; unequaled, unparalleled or unmatched.
Of a feature, such that only one holder has it.
Particular, characteristic.