• (n.) A composition resembling a fugue. • (a.) in the gugue style, but not strictly like a fugue.
(from the article `fugue`) A fughetta is a short fugue, with exposition plus only a few restatements of the subject. Fugato applies to music where only part of a fugue—usually ...
Fu·ga'to adjective (Mus.) in the gugue style, but not strictly like a fugue. -- noun A composition resembling a fugue. 
In music, fugato describes a composition in the fugue style, but not strictly like a fugue.
a section of a composition that is in fugal style but does not constitute a real fugue.