1》 Grammar (of a word or form) denoting or referring to just one person or thing.
2》 exceptionally good or great; remarkable.
↘strange or eccentric in some respect.
3》 Mathematics (of a square matrix) having a zero determinant.
4》 Physics & Mathematics relating to or of the nature of a ~ity.
■ noun Grammar the ~ form of a word.
ME: from OFr. singuler , from L. ~is , from singulus (see single ).