Separate or apart from others; single; distinct.

Engaged in by only one on a side; single.

Existing by itself; single; individual.

being a single and separate person or thing; "can the singular person be understood apart from his culture?"; "every fact in the world might be singular...unlike any other fact and sole of its kind"-William James

grammatical number category referring to a single item or unit

the single one of its kind; "a singular example"; "the unique existing example of Donne's handwriting"; "a unique copy of an ancient manuscript"; "certain types of problems have unique solutions"

a single thing, only one thing (for instance: a dog or the rocket)

Describes an equation that can be solved by modifying an image of a single equation until it arrives at the solution.