The DSM-IV defines[1] as:
sudden, unexpected travel away from home or one's customary place of work, with inability to recall one's past,
confusion about personal identity, or the assumption of a new identity, or
significant distress or impairment.
The Merck Manual[6] defines Dissociative Fugue as:
One or more episodes of amnesia in which the inability to recall some or all of one's past and either the loss of one's identity or the formation of a new identity occur with sudden, unexpected, purposeful travel away from home.
In support of this definition, the Merck Manual[6] further defines dissociative amnesia as:
An inability to recall important personal information, usually of a traumatic or stressful nature, that is too extensive to be explained by normal forgetfulness.