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