Yes, it's possible, and it's a healthy thing to accomplish.
Forgiveness is letting go of the anger, resentment, regret, etc -- no longer hanging on to the "personal story" about what happened and it's perceived meaning.
When these incidents occur, it's this interpretation which lives on in the mind of the abused person... the trauma of the incident itself is long gone, but the interpretation takes on a life of it's own and becomes part of the abused person's identity. THAT is something which is quite resolvable, and that is what forgiveness is all about.
It doesn't mean that you should trust the person again, it means that your present life and sense of self are no longer defined by what happened. Just because you were a victim in the past does not mean you must perpetually remain a victim.