A unique specimen.
A form of a word that refers to only one person or thing.
That which is not general; a specific determinate instance.
Being the only one of the kind; unique.
Referring to only one thing or person.
Distinguished by superiority: peerless, unmatched, eminent, exceptional, extraordinary.
Having the property that the matrix of coefficients of the new variables has a determinant equal to zero.
Out of the ordinary; curious.
Each; individual.
Being only one of a larger population.
Not equal to its own cofinality.
Having no inverse.