Something unique and remarkable.
Something that is done, created, etc. only once, and often quickly, simply, or improvisationally.
Occurring once, independent of any pattern; one-time.
Singular; unique; special; remarkable.
A person or thing situated away from the main body or outside its proper place.
A part of a formation separated from the rest of the formation by erosion.
An exception.
A value in a statistical sample which does not fit a pattern that describes most other data points; specifically, a value that lies 1.5 IQR beyond the upper or lower quartile.