An actor's experience of a category, tie, role, network, group or organization, coupled with a public representation of that experience; the public representation often takes the form of a shared story, a narrative.
Tilly, Charles. "Citizenship, Identity, and Social History", 1-17 in Tilly, Charles ed., Citizenship, Identity, and Social History. Cambridge University Press, Cambridge: 1996:7
Finkenauer et al., 2002
Identity ... represents the aspect of the self that is accessible and salient in a particular context, that interacts with the environment, and to which the person is committed.
Finkenauer, Catrin, et al. "Self and identity in early adolescence." Understanding early adolescent self and identity: Applications and interventions 2002:28.